Table 1. Sequence diversity in a hydrophobic pocket outside the heme active site.

Rat nNOS	Met336	Leu337	Tyr706	Trp306(B)
Human nNOS	Met341	His342	Tyr711	Trp311(B)
Bovine eNOS	Val106	Leu107	Tyr477	Trp76(B)
Human eNOS	Val104	Phe105	Tyr475	Trp74(B)
Murine iNOS	Met114	Asn115	Tyr485	Trp84(B)
Human iNOS	Met120	Thr121	Tyr491	Trp90(B)