C4A (Complement C4A (Rodgers Blood Group)) is a Protein Coding gene. Diseases associated with C4A include C4a Deficiency and Immunodeficiency Due To A Classical Component Pathway Complement Deficiency. Among its related pathways are Complement Pathway and Innate Immune System. GO annotations related to this gene include endopeptidase inhibitor activity and complement component C1q binding. An important paralog of this gene is C4B. C4B (Complement C4B (Chido Blood Group)) is a Protein Coding gene. Diseases associated with C4B include C4b Deficiency and Immunodeficiency Due To A Classical Component Pathway Complement Deficiency. Among its related pathways are Innate Immune System and Complement Pathway. GO annotations related to this gene include carbohydrate binding and complement binding. An important paralog of this gene is C4A.