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Summary Twenty‐six species of freshwater invertebrates were assayed in vitro for cellulase activity. A soluble cellulose derivative and crystalline cellulose powder were weakly hydrolysed by gut extracts from several insects, and more strongly hydrolysed by extracts from molluscs and crustaceans. There was no correlation between the occurrence of cellulase and the abundance of cellulose in the diet.
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D. C. Monk (1976) studied this question.
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