GCH1 GI:66932972 GTP cyclohydrolase 1 isoform 3 1 mekgpvrapa ekprgarcsn gfperdpprp gpsrpaekpp rpeaksaqpa 50 51 dgwkgerprs eednelnlpn laaayssils slgenpqrqg llktpwraas 100 101 amqfftkgyq etisdvlnda ifdedhdemv ivkdidmfsm cehhlvpfvg 150 151 kvhigylpnk qvlglsklar iveiysrrlq vqerltkqia vaitealrpa 200 201 gvgvvveats aep