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GC-MS chromatograms of the main AR containing cereals: wheat, rye, and barley. The ratio of the different odd-numbered saturated homologues varies from grain to grain but is generally conserved from variety to variety. The ratio C17 : 0/C21 : 0 can be used to determine if a cereal sample is wheat (~0.1) or rye (~1.0) and is reflected partially in plasma.
