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Cartoon of RCCX unit gene. Flanking genes, CYP21A2, and CYP21A1P are located in the class III region of the MHC on chromosome 6p21.3. RP1 encodes a nuclear threonine/serine protein kinase. C4A (Rodgers blood group) and C4B (Chido blood group) encode functional complement 4. TNXB encodes tenascin, an extracellular protein. TNXA is the deleted form of TNXB and encodes a pseudogene. RP2 is the truncated form of RP1.
