In a message dated 8/6/99 8:47:59, email@example.com wrote:
> > An extremely deep purple, flecked with transient green dots (which
> > come from fluorescence of optical pigments).
>According to some forgotten source (Stryer?) certain monkeys have a
>fourth color in the making, in a couple of megayears there could have
>been four-color vision primates. (Of course if there is a Singularity
>the Earth won't probably exist by then).
Stryer, 3rd edition, p 1038. The monkey in question is Homo sapiens, which sometimes harbors duplications of our green photoreceptor gene. There is also a polymorphism in our (I think) red photoreceptor in that there are two different genes with slightly different absorption frequencies.