“…The degree of islet innervation of the Squamata varies with the species, and VIP has been identified in islet nerves. Exceptions to this rule seem to be the amphisbaenid lizards (Gabe, 1970;Rhoten, 1970) and the water snake, Natrix piscator (Rangneker and Padgaonkar, 1972). Fujii et aL, 1980;Fujita et aL, 1982;Buchan, 1984;Buchan et aL, 1985).…”