6.3.2.18 An in vitro characterization of gamma-glutamylhistamine synthetase: a novel enzyme catalyzing histamine metabolism in the central nervous system of the marine mollusk, Aplysia californica Aplysia californica 6.3.2.18 Metabolism of the histamine in the CNS of Aplysia californica: cellular distribution of gamma-glutamylhistamine synthetase Aplysia californica