Autoradiography of the electrophoresis of PCR products after amplification of CA samples. A 6% polyacrylamide gel was used as described in Materials and Methods. (A) Sample heterozygous for alleles b3 and b5. (B) Sample heterozygous for the b4 and b5 alleles. (C) Sample homozygous for the b4 allele. (D) Sample homozygous for the b4 allele. (E) Sample heterozygous for the b4 and b5 alleles.