| Approved Symbol | Approved Name | Previous Symbols | Aliases | Chromosome | Accession Numbers | RefSeq IDs |
|---|
| C1QA | complement component 1, q subcomponent, A chain | | | 1p36.3-p34.1 | AF135157 | NM_015991 |
| C1QB | complement component 1, q subcomponent, B chain | | | 1p36.3-p34.1 | X03084 | NM_000491 |
| C1QC | complement component 1, q subcomponent, C chain | C1QG | | 1p36.11 | AK057792 | NM_172369 |
| C1R | complement component 1, r subcomponent | | | 12p13 | M14058 | |
| C1S | complement component 1, s subcomponent | | | 12p13 | | NM_001734 |
| C2 | complement component 2 | | | 6p21.3 | | |
| C3 | complement component 3 | | CPAMD1 | 19p13.3-p13.2 | J04763 | NM_000064 |
| C3AR1 | complement component 3a receptor 1 | | C3AR, AZ3B | 12p13.31 | U28488 | |
| C4A | complement component 4A (Rodgers blood group) | | CPAMD2, C4S, CO4, C4, C4A3, C4A2, C4A4, C4A6, C4B, RG | 6p21.3 | L26261, M14823, X77491, AY224378 | NM_007293 |
| C4B | complement component 4B (Childo blood group) | | CPAMD3, C4F, CO4, C4B1, C4B3, CH | 6p21.3 | AF019413 | NM_001002029 |
| C5 | complement component 5 | | CPAMD4 | 9q33-q34 | M57729 | NM_001735 |
| C5AR1 | complement component 5a receptor 1 | C5R1 | C5A, C5AR, CD88 | 19q13.3-q13.4 | | NM_001736 |
| C6 | complement component 6 | | | 5 | J05024 | |
| C7 | complement component 7 | | | 5 | J03507 | |
| C8A | complement component 8, alpha polypeptide | | | 1p32.2 | M16974 | NM_000562 |
| C8B | complement component 8, beta polypeptide | | | 1p36.2-p22.1 | M16973 | |
| C8G | complement component 8, gamma polypeptide | | | 9q | X06465 | |
| C9 | complement component 9 | | | 5p14-p12 | | |
| CD46 | CD46 molecule, complement regulatory protein | MIC10, MCP | TRA2.10, MGC26544, TLX | 1q32 | BC030594 | NM_172361 |
| CD59 | CD59 molecule, complement regulatory protein | MIC11, MIN1, MSK21, MIN2, MIN3 | 16.3A5, EJ16, EJ30, EL32, G344, p18-20 | 11p13 | | NM_203329 |
| CFB | complement factor B | BFD, BF | H2-Bf | 6p21.3 | L15702 | NM_001710 |
| CFD | complement factor D (adipsin) | DF, PFD | ADN | 19p13.3 | M84526 | NM_001928 |
| CFH | complement factor H | HF, HF1, HF2 | HUS, FHL1, ARMS1 | 1q32 | Y00716 | NM_000186 |
| CFHR1 | complement factor H-related 1 | HFL1, CFHL1, CFHR1P, HFL2, CFHL1P | H36-1, FHR1, CFHL, H36-2 | 1q32 | M65292 | NM_002113 |
| CFHR2 | complement factor H-related 2 | HFL3, CFHL2 | FHR2 | 1q31.3 | X64877 | NM_005666 |
| CFHR3 | complement factor H-related 3 | CFHL3 | FHR-3, HLF4, FHR3, DOWN16 | 1q32 | X68679 | NM_021023 |
| CFHR4 | complement factor H-related 4 | CFHL4 | FHR-4, FHR4 | 1q32 | X98337, AJ640130 | NM_006684 |
| CFHR5 | complement factor H-related 5 | CFHL5 | FHR5, FHR-5 | 1q31.3 | AF295327 | NM_030787 |
| CFI | complement factor I | IF | FI, C3b-INA, KAF | 4q25 | J02770 | NM_000204 |
| CFP | complement factor properdin | PFC | | Xp11.4 | M83652 | NM_002621 |
| CR1 | complement component (3b/4b) receptor 1 (Knops blood group) | | CD35, KN | 1q32 | Y00816 | NM_000573 |
| CR1L | complement component (3b/4b) receptor 1-like | | | 1q32.1 | AY114160 | XM_114735 |
| CR2 | complement component (3d/Epstein Barr virus) receptor 2 | | CD21 | 1q32 | M26004 | NM_001877 |
| ITGAM | integrin, alpha M (complement component 3 receptor 3 subunit) | CR3A, CD11B | MAC-1, CD11b | 16p11.2 | J03925 | NM_000632 |
| ITGAX | integrin, alpha X (complement component 3 receptor 4 subunit) | CD11C | CD11c | 16p11.2 | BC038237 | NM_000887 |
| ITGB2 | integrin, beta 2 (complement component 3 receptor 3 and 4 subunit) | CD18, MFI7 | LFA-1, MAC-1 | 21q22.3 | AK222505 | NM_000211 |
