Research associate Wei Li places mice with KAT7 intervention on a treadmill in the animal facility at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

Dr. Shuhui Sun performs a step of histological staining of mouse liver for pathological analysis in the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

Researchers work in the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

Dr. Shuhui Sun performs histological staining of mouse liver for pathological analysis in the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

The nameplate for the Aging and Regeneration laboratory is seen at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

Dr. Jing Qu (R), team leader for Stem Cell and Ageing group, and Dr. Wei Wang discuss the work on genome-wide screen for novel ageing regulatory genes in human stem cells at the cell culture room of the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

A researcher cultures mesenchymal progenitor cells in the cell culture room of Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

A researcher observes the confocal image on a screen showing the nucleus of human stem cells after KAT7 intervention, in the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

Researchers collect the mesenchymal progenitor cells in tubes for the following cell culture in the cell culture room of the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

Dr. Shuhui Sun performs a step of histological staining of mouse liver for pathological analysis in the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang

A banner shows the images of three former Mexico's presidents, as members of the ruling National Regeneration Movement (MORENA) organize documents with citizens' signatures after gathering them for a ballot measure that could put former presidents on trial for corruption in Mexico City, Mexico, September 14, 2020. REUTERS/Edgard Garrido

Members of the ruling National Regeneration Movement (MORENA) organize documents with citizens' signatures after gathering them for a ballot measure that could put former Mexican presidents on trial for corruption in Mexico City, Mexico, September 14, 2020. REUTERS/Edgard Garrido

Members of the ruling National Regeneration Movement (MORENA) organize documents with citizens' signatures after gathering them for a ballot measure that could put former Mexican presidents on trial for corruption in Mexico City, Mexico, September 14, 2020. REUTERS/Edgard Garrido

Members of the ruling National Regeneration Movement (MORENA) organize documents with citizens' signatures after gathering them for a ballot measure that could put former Mexican presidents on trial for corruption in Mexico City, Mexico, September 14, 2020. REUTERS/Edgard Garrido

Members of the ruling National Regeneration Movement (MORENA) organize documents with citizens' signatures after gathering them for a ballot measure that could put former Mexican presidents on trial for corruption in Mexico City, Mexico, September 14, 2020. REUTERS/Edgard Garrido

The Houses of Parliament stands in the distance on Westminster Bridge in London, Britain March 5, 2020. REUTERS/Simon Dawson

Grass shoots grow through the burnt ground of Cobargo resident Belinda Shea’s destroyed home in Cobargo, Australia January 6, 2020. REUTERS/Tracey Nearmy

A man takes out his hand throughout the waterfall at Muhan Pokhari in Bhaktapur, Nepal September 21, 2019. REUTERS/Monika Deupala

Biologist Maria Fernanda, 27, who is doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, is pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologists Pedro Henrique Salomao, 26, Francesca Larrea, 28, Maria Fernanda, 27, and volunteer firefighter Bruna Bichara, 35, who are doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, are pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologist Francesca Larrea, 28, who is doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, is pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologist Pedro Henrique Salomao, 26, who is doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, holds a dead cricket in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologists Pedro Henrique Salomao, 26, and Francesca Larrea, 28, who are doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, are pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologists, who are doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, are pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologist Francesca Larrea, 28, who is doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, is pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologist Pedro Henrique Salomao, 26, who is doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, is pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

Biologist Pedro Henrique Salomao, 26, who is doing a research which aims to classify dead animals and the regeneration of a burned area of Amazon forest near Alter do Chao, is pictured in Santarem, Para state, Brazil September 19, 2019. Picture taken September 19, 2019. REUTERS/Ricardo Moraes

General view of Zincirlikuyu transport hub in Besiktas district is pictured in Istanbul, Turkey, July 31, 2019. REUTERS/Murad Sezer

Skyscrapers of banks' headquarters and popular shopping malls are pictured next to the residential apartment blocks and Zincirlikuyu cemetery in Istanbul, Turkey, July 31, 2019. REUTERS/Murad Sezer

Skyscrapers of banks' headquarters and popular shopping malls are pictured next to the residential apartment blocks and Zincirlikuyu cemetery in Istanbul, Turkey, July 31, 2019. REUTERS/Murad Sezer

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, holds a honeycomb, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard TPX IMAGES OF THE DAY

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, holds a queen bee in her hand, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, holds a honeycomb, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, puts a queen bee in box to transport, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, puts a queen bee in box to transport, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, puts a larva in a small container that will later become a royal cell, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, picks up a larvae from a honeycomb, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, picks up a larvae from a honeycomb, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, holds a royal cell where the queen will grow up, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, holds a honeycomb, in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Alexandrine Brion, a beekeeper who breeds queen bees for her beekeeper colleagues that need to regenerate their hives, holds a queen bee in her hand in La Bollene-Vesubie, France, July 2, 2019. Picture taken July 2, 2019. REUTERS/Eric Gaillard

Mexico's new Finance Minister Carlos Urzua chats with lawmaker Porfirio Munoz Ledo of the ruling National Regeneration Movement party (MORENA) during the presentation of the 2019 national budget at the Congress in Mexico City, Mexico December 15, 2018. REUTERS/Alexandre Meneghini

Mexico's new Finance Minister Carlos Urzua arrives to present the 2019 national budget next to lawmaker Porfirio Munoz Ledo of the ruling National Regeneration Movement party (MORENA) at the Congress in Mexico City, Mexico December 15, 2018. REUTERS/Alexandre Meneghini

Mexico's new Finance Minister Carlos Urzua presents the 2019 national budget next to lawmaker Porfirio Munoz Ledo of the ruling National Regeneration Movement party (MORENA) at the Congress in Mexico City, Mexico December 15, 2018. REUTERS/Alexandre Meneghini

Mexico's new Finance Minister Carlos Urzua jokes with lawmaker Porfirio Munoz Ledo of the ruling National Regeneration Movement party (MORENA) during the presentation of the 2019 national budget at the Congress in Mexico City, Mexico December 15, 2018. REUTERS/Alexandre Meneghini

Mexico's new Finance Minister Carlos Urzua jokes with lawmaker Porfirio Munoz Ledo of the ruling National Regeneration Movement party (MORENA) during the presentation of the 2019 national budget at the Congress in Mexico City, Mexico December 15, 2018. REUTERS/Alexandre Meneghini

Mexico's new Finance Minister Carlos Urzua presents the 2019 national budget as lawmaker Porfirio Munoz Ledo of the ruling National Regeneration Movement party (MORENA) looks on at the Congress in Mexico City, Mexico December 15, 2018. REUTERS/Alexandre Meneghini

Lawmaker Mario Delgado (L) of the ruling National Regeneration Movement (Morena) chats at the Congress in Mexico City, Mexico December 13, 2018. REUTERS/Edgard Garrido

Lawmaker Pablo Gomez of the ruling National Regeneration Movement (Morena) gestures at the Congress in Mexico City, Mexico December 13, 2018. REUTERS/Edgard Garrido

Lawmakers Mario Delgado (L) of the ruling National Regeneration Movement (Morena) and Marco Adame of the National Action Party (PAN) chat at the Congress in Mexico City, Mexico December 13, 2018. REUTERS/Edgard Garrido

Houses are pictured in Sennari district in Sakura, Chiba Prefecture, Japan, November 7, 2018. Picture taken November 7, 2018. To match Insight JAPAN-AGEING/TWOCITIES REUTERS/Kim Kyung-Hoon

The setting sun is seen reflecting off 1 World Trade Center and other buildings in Manhattan in New York City, U.S., December 4, 2018. REUTERS/Brendan McDermid

The setting sun is seen reflecting off 1 World Trade Center and other buildings in Manhattan in New York City, U.S., December 4, 2018. REUTERS/Brendan McDermid

A view of dry tree branches on the ground and the restoration works inside al-Zahir Baybars Mosque, an architectural landmark in old Cairo, Egypt October 16, 2018. Picture taken October 16, 2018. REUTERS/Amr Abdallah Dalsh

A general view of Las Vegas, Nevada, U.S., August 26, 2018. Picture taken August 26, 2018. REUTERS/Mike Blake

Yeidckol Polevnsky, President and General Secretary of the National Regeneration Movement (MORENA), party of the Mexico's president-elect Andres Manuel Lopez Obrador, talks to the media during the 5th Business Meeting of the Pacific Alliance in Puerto Vallarta, Jalisco, Mexico July 23, 2018. REUTERS/Carlos Jasso

Yeidckol Polevnsky, President and General Secretary of the National Regeneration Movement (MORENA), party of the Mexico's president-elect Andres Manuel Lopez Obrador, talks to the media during the 5th Business Meeting of the Pacific Alliance in Puerto Vallarta, Jalisco, Mexico July 23, 2018. REUTERS/Carlos Jasso

Yeidckol Polevnsky, President and General Secretary of the National Regeneration Movement (MORENA), party of the Mexico's president-elect Andres Manuel Lopez Obrador, talks to the media during the 5th Business Meeting of the Pacific Alliance in Puerto Vallarta, Jalisco, Mexico July 23, 2018. REUTERS/Carlos Jasso