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Free amino acid pools were analysed in Acyrthosiphon pisum reared on Vicia faba L. and on three artificial diets with different amino acid profiles: diets A and B copying the very unbalanced profiles of phloem saps of alfalfa and broad bean respectively, diet C deriving from aphid carcass analysis. Total free amino acid levels ranged from 46.9 ± 2.3 nmol mg -1 fresh weight for aphids...