Earlier quoted context omitted.
This leans more to the physiology side of the prize I believe.
right I'm saying that 'biology' is a more appropriate term than physiology.
Physiology is a more descriptive term for this work. You could argue this is "cell biology", but that's just a claim that these fields are exclusive of each other; much modern physiological work is now understanding the underlying molecular processes (maybe it is molecular biology?).
His work on molecular mechanisms has brought better understanding of higher level processes in the body and traditional "physiologic" mechanisms.