Figure 2From: C4B null alleles are not associated with genetic polymorphisms in the adjacent gene CYP21A2in autism The 30 kb deletion/conversion of C4B and CYP21A2. This diagram depicts the most common arrangement of the RP, C4, CYP21, and TNX (RCCX) gene module. Pseudogenes or gene fragments are red. The 30 kb deletion removes part of CYP21A1P, TNXA, RP2, C4B and part of CYP21A2 leaving a non-protein encoding CYP21A1P/CYP21A2 region.Back to article page