Abstract
1. 1. Eighteen molluscan species were examined for the presence of d-alanine and alanine racemase activity to probe the probable relation between them. 2. 2. Two bivalve species had high concentration of d-alanine and l-alanine (1:1) and showed high activities of alanine racemase. In these species, the occurrence of d-alanine could be explained by the action of alanine racemase. 3. 3. In other species, the levels of d-alanine and enzyme activity were low, and the occurrence of d-alanine did not correspond with the presence of alanine racemase activity. 4. 4. The mechanism of the occurrence of d-alanine in molluscan tissues seems to vary from species to species and seems not to be associated with the phylogenic situation or habitats of the respective species.
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