- Rab1
- Rab2
- Rab3
- Rab4
- Rab5
- Rab6
- Rab7
- Rab8
- Rab9
- Rab11
- Rab27
- Rac1
- RANTES
- Rap1
- Rap1GAP
- Raptor
- Ras
- RCAN1
- Reg1 / PSP
- RGS proteins
- RHEB
- RhoA
- RhoC
- p122RhoGap
- p190RhoGAP
- p200RhoGap
- p115RhoGEF
- Rho Kinase
- Pancreatic Ribonuclease (secretory)
- Ribosomal Protein S6
- Ryanodine Receptor
