“…Lactate dehydrogenase-2 (Ldh-2) As reported by Levy and Salthe (1974) and confirmed by our analysis, all species of the Rana pipiens complex are monomorphic or nearly so for the same allele (designated in our study as Ldh-Z"), In several studies of electrophoretic variation in Ldh-2, involving thousands of specimens, only six variants (all heterozygotes) have been found. One of these was a specimen from transect locality 3, collected in 1975, with the genotype Ldh-2 a/Ldh-2b Transect populations.-Five alleles were detected in the study area.…”