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Homarine was isolated from nine edible species of marine molluscs belonging to classes Gastropoda, Bivalvia, and Cephalopoda. A thorough chromatographic, NMR and MS study provided evidence that homarine is a common and abundant metabolite of all these species. This study casts doubt on a previous assertion that 1,1'-dimethyl-[2,2']-bipyridinium is a metabolite of the Bivalve Callista chione.
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Polychronopoulos et al. (2001) studied this question.
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