Figure 3.—

The nucleotide sequence of the repeats of the constant region. Repeats are designated by letters, as in Figure 1. The mouse species in which each repeat is found is shown (M. m., M. musculus; M. s., M. spretus; M. m./s., both M. musculus and M. spretus). For each repeat, the canonical sequence defined earlier in the A₂ allele is shown in full (Djian et al. 1993); variant repeats differing from the canonical sequence are indicated with a superscript and only their divergent nucleotides are written. Marker nucleotides differing from the murid consensus (con) are in boldface type. Marker nucleotides shared by all M. m. alleles alone or by all M. s. alleles alone are boxed. Two marker nucleotides that distinguish the C and J repeats typical of M. m. domesticus from the C¹ and J¹ repeats typical of M. m. musculus are circled. Unshared marker nucleotides are underlined; as shown in Figure 2, the corresponding variant repeats are found in some strains, but not in others.