To put that in perspective, the Earth is thought to be about 4.5 billion years old, which means these "rocks"—really ...

Patagonia’s ‘living rocks’ hold ancient bacterial biofilms, offering insights into early life and potential bioengineering ...

which I proposed for a genus of bacteria in 1927, had already been given to a Mycetozoan by Jahn in 1906.

In the bacterium M. smegmatis, an enzyme called MftG allows the cofactor mycofactocin to transfer electrons released during ethanol metabolism to the electron transport chain.