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Chemical ionization mass spectra of methyl pyroglutamate (the product of glutamine methylation) from extracted corn seedlings that were grown for 12 days with 13CO2 enrichment (A), volicitin from caterpillars that fed on unlabeled corn seedlings for 48 h (B), and volicitin from beet armyworms that fed on unlabeled corn plants and then fed 6 h on 13C-labeled corn seedlings (C).
