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SAN FRANCISCO, Dec. 2, 2021 /PRNewswire/ -- At the earliest stages of a new human life, cells that seem identical begin to divide into distinct types that eventually grow into a diverse array of tissues and organs. During this process, neighboring tissues exchange chemical signals that prompt different steps of each other's development. But this crosstalk is complex and dynamic, and therefore difficult to study.

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Over the last year, school board meetings have become ground zero for the country’s culture wars as irate parents have showed up in droves to decry school COVID closures, mask mandates, and critical race theory, as well as transgender policies.

SAN FRANCISCO, Nov. 29, 2021 /PRNewswire/ -- Twitter, Inc. (NYSE: TWTR) today announced that Jack Dorsey has decided to step down as Chief Executive Officer and that the Board of Directors has unanimously appointed Parag Agrawal as CEO and a member of the Board, effective immediately. Dorsey will remain a member of the Board until his term expires at the 2022 meeting of stockholders. Bret Taylor was named the new Chairman of the Board, succeeding Patrick Pichette who will remain on the Board and continue to serve as chair of the Audit Committee. Agrawal has been with Twitter for more than a decade and has served as Chief Technology Officer since 2017.