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15N NMR spectra of S. litura larval whole body (A), authentic [amino-15N]glutamine and [amide-15N]glutamine (B), gut content extracts (C), N-linolenoyl-l-glutamine synthesized with amide-15N-labeled glutamine (D), and N-linolenoyl-l-glutamine synthesized with amino-15N-labeled glutamine (E), measured at 50.55 MHz. [15N]Ammonium chloride at 15.5 ppm was used for the internal standard.
