Abstract
A cytolytic toxin from the sea anemone Condylactis gigantea was isolated and characterized as a thermolabile basic protein (p I 8.9) having a molecular weight of 18,300. It lacks methionine but contains relatively large amounts of glycine, serine, tryptophan, and half-cystine. Its hemolytic action is inhibited by sphingomyelin. It is lytic for rabbit blood platelets, is lethal in low concentration for crayfish (LD 50 = 0.06 μg), and may be identical with a neurotoxic protein isolated earlier from the same species. It broadly resembles the toxin of Stoichactis helianthus but differs from it in amino acid composition and in minor respects.
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