- C
- CHRNB2
- CHRNB4
- CysEP
- Choline transporter
- CHRNB1
- CHRND
- CHRNG
- CCKA
- CCKB
- CRTAM
- C6
- C9
- CFB
- CFC
- CFD
- CXCR4
- CXCR5
- CXCR6
- C2
- C3
- C4B
- C5
- CHRNA3
- CHRNA4
- CHRNA5
- CHRNA6
- CHRNA7
- CHRNA9
- CHRNA10
- CPS1
- CST3
- CST6
- CST9
- CALCR
- CB1
- CB2
- CASR
- CD40LG
- CRF receptor
- CD70
- CCKR
- CCKAR
- CCKBR
- CKR
- CCR
- CCR1
- CCR2
- CCR3
- CCR4
- CCR5
- CCR6
- CCR7
- CCR8
- CCR9
- CCR10
- CMKLR1
- CMKLR2
- CXCR
- CXCR1
- CATSPER
- CXCR2
- CXCR3
- COQ8A
- COQ8B
- CLPS
- Class A GPCR
- CRX
- CRAC
- Carbamoyltransferase
- ChAT
- Class B GPCR
- C-Rel
- Cysteine synthase
- CNR
- CNTNAP2
- CLCN
- CD158
- CD158B2
- CD160
- CD200R
- CYSLTR
- CD79
- CD96
- Cytokine receptor
- CSF2RB
- CH2
- CADM1
- CBS
- CutC
- CrtN
- CYPOR
- CHRM1
- CHRM2
- CELSR3
- CHRM3
- CHRM4
- CHRM5
- CHRNA1
- CHRNA2
- COPZ1