Southern Canada (southeastern British Columbia to southern Northern Territory east to Labrador and Nova Scotia) south through eastern Washington eastern Oregon, Nevada and adjacent California to northern Arizona, northern New Mexico (with islolated populations along the Rio Grande south to Las Cruces), thence east-northeast to central Nebraska, Ohio, northern Kentucky, West Virginia, and New England, USA
A.L. Salmon et al. / Journal of Biological Chemistry 276 (2001) 10145-10152. Peptide leucine arginine, a potent immunomodulatory peptide isolated and structurally characterized from the skin of the Northern Leopard frog, Rana pipiens; M.L. Mangoni et al. / Biochemistry 42 (2003) 14023-14035. Ranacyclins, a new family of short cyclic antimicrobial peptides: biological function, mode of action, and parameters involved in target specificity