Chlorophyll and rhodopsin in particular, but there are others as well.
There's one, I forget its name alas, that can exist in
two slightly different forms, the difference being that a small
"dent" in the molecule can be either "in" or "out". It can change,
and the information thus sent to the other end "at the speed of decoherence",
(my term, not his), which he is very keen on, and observes is about
the fastest effect that can occur in physical systems, just under lightspeed.
He explains how this has super-rapid effects *after* holding a superposition
state for a remarkably long time for warm wet systems - on the order of
one or two seconds! Amazing. I forget the details, alas.
Not having the book with me now, I can't fully answer the query
about his take on consciousness, but I *can* tell you it is ruthlessly
objective and reductionist. He would get on well with Dawkins and
Dennett, but not well with Husserl or the crypto-religious, or anyone
wanting to discuss consciousness from a subjective PoV.
But that just makes him like most scientists, after all.
-- unTangling Taylor
** When blackberries are red, they're still green.