"This is the first time we’ve observed a circadian clock using pulse amplitude modulation, a concept typically associated with communication technology, to control biological functions."
Cyanobacteria use an AM radio-like mechanism to regulate their genes, with the cell division cycle acting as a “carrier wave” and their circadian clock modulating the pulse strength to integrate signals from these two rhythms. This discovery explains how cells coordinate these oscillatory processes.
It is striking to see examples in nature of what we sometimes think of as ‘our’ engineering rules,” said co-corresponding author Dr Martins. “The cyanobacterial lineage evolved 2.7 billion years ago, and have an elegant solution to this information processing problem.”
https://scitechdaily.com/scientists-discover-radio-like-communication-in-ancient-bacteria/