Figure 1.—

Coding region of the mouse involucrin gene. Two-thirds to four-fifths of the coding region is composed of a segment of 19–41 repeats of 13–16 codons. This segment consists of 5′ and 3′ constant regions shared by all mouse alleles and the rat and a variable region, which differs in the various mouse alleles. Repeats shared by the mouse and the rat are indicated by uppercase letters. One repeat, shared by all mouse alleles but not found in the rat, is designated “a” (Delhomme and Djian 2000). Arrows represent primers used in the PCR amplification of the segment of repeats.