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The free amino acid content of the blood of insects is strikingly high in comparison with that of other animals. It varies from 40 mg.% in adults and young larvae to as high as 385. mg. % in some mature larvae and in pupae (3, 5, 7, 11, 12, 13, 16, 17, 22, 29). Comparable values for the blood of decapod Crustacea are from 1.6 to 8 mg. % (23) and for whole human blood 6 mg. % (14).
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John J. Pratt (1950) studied this question.
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