Researchers used powerful tech to analyse thousands of individual cells at once, considering which genes are active and how DNA is organised within each cell.

An otolith, or fish ear bone, from Putah Creek-origin chinook salmon viewed under a microscope. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to ...

and an inspiration for us was Stephen Jay Gould's famous essay 'An earful of jaw,' which laid out how fish jawbones transformed into the middle ear bones of mammals. "This made us wonder whether ...