G proteins. The importance of being GTP.
Bourne
H R
HR
D000818:Animals; D006153:Guanosine Diphosphate / Q000737:chemistry; D006160:Guanosine Triphosphate / Q000737:chemistry; D006801:Humans; D011487:Protein Conformation; D013329:Structure-Activity Relationship; D015293:Transducin / Q000737:chemistry*
D006153:Guanosine Diphosphate; D006160:Guanosine Triphosphate; D015293:Transducin