Amplification of repetitive polymorphic microsatellite markers mapping within the Naip array of the C57BL/6J haplotype. Autoradiography of 6% denaturing polyacrylamide gel of PCR products amplified from genomic DNA and genomic clones using primers for STS D13Die31 (A) and microsatellite markers D13Die7 (B), D13Die25 (C), D13Die35 (D), and D13Die36 (E). (A) Four bands representing four distinct D13Die31 loci are labeled A–D, from largest to smallest. A single genomic clone, 212o22, which includesNaip5 (band C) and Naip1 (band D) spans the entire central repeat region of the Naip array. (B–E) Microsatellite repeat markers identify and separate two loci for each marker present in C57BL/6J genomic DNA.