- Gab1
- GADD34
- Galanin
- Gamma glutamyl transpeptidase
- Gamma secretase
- Galpha q/11
- Galpha s
- Galpha i
- Galpha 12/13
- GAPDH
- Gastrin
- Gata-4
- Gli
- GLP-1
- Glucagon
- Glucocorticoid receptor
- Glucosidase I,II
- GM130
- cGMP
- GP-2
- GP-3
- Grb2
- GRP94
- GRP170 (Orp150)
- GSK3
- Guanylate cyclase
