IR-Met and IR-leu-enkephalin content in the perioesophageal ganglia of Helix aspersa seasonal variations.

Abstract

1. In order to determine the presence of opioid peptides and their possible variation throughout the year in the different ganglia of the perioesophageal ring of the terrestrial snail Helix aspersa, radioimmunoassays with highly specific antisera risen for Met-enkephalin (ME) and Leu-enkephalin (LE) were carried out monthly. 2. Clear monthly variation in… (More)

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