Check this out,
Elowitz MB, Surette MG, Wolf P-E, Stock J, Leibler S. (1997).
Photoactivation turns green fluorescent protein red.
Current Biology 7(10), 809-812.
It is kind of old, so you might already have it.
On 28 Nov 1997, BAERBEL KRETSCHMER wrote:
> I heard about a new GFP-mutant with an emission maximum of 630 nm. The
> description of these mutant might already have been published. Does anybody
> know if it has been published? And if yes,which journal.
> Thanks in advance.
> BAERBEL KRETSCHMER alias baekret at sbox.tu-graz.ac.at>>>>