Table 1.

Amino acids occupying positions 148, 165, and 203 (GFP numbering) in known GFP-like proteins.

	148	165	203
FPs	Ser, His	Ile, Val, Phe	His, Ser, Thr
CPs	Cys, Ala, Asn	Asn, Ser	Leu, Ile, His, Arg