Evolutionary trees of proteins analysed by means of computer comparative methods were reconstructed and the level of the structure and functional relationship was revealed. The distance between the percent amino acid contents was used to classify a group of toxins from the sea anemone Radianthus macrodactylus, which proved to belong to long neurotoxins. The scores were calculated by the pattern recognition method. By the use of the distance values, ten phospholipases A2 were divided into two groups, containing representatives of the most closely related organisms.
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