In April 2014, when Winter Soldier came out, the denizens of the internet made fun of the scene with the meme. Any moment where whispering was observed became a “Hail Hydra” moment.

Dr. Mortazavi was also surprised to find that gene expression timing varied so much between head regeneration and budding. “Clearly there’s more than one way to make a head,” he said.

Near their mouthparts, hydra have a cluster of 50 to 300 cells called the head organizer; as its name implies, it directs the development of the head. If a hydra is beheaded, a new organizer can ...

Published Dec 9, 2021 6:45 AM CST Updated Jan 4, 2022 12:21 AM CST ...