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FAC and glutamine metabolism. (A) 15N-glutamine synthesis and distribution 16 h after feeding artificial diet enriched with [15N]ammonium chloride and glutamic acid (a) or ammonium chloride and [15N]glutamic acid (b), with or without linolenic acid (control). (B) Putative model of FAC and glutamine metabolism in S. litura larval midgut. GS, glutamine synthetase.
