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Gas chromatograms of reproductive and worker castes in R. flavipes. Females are marked in red and males in blue. The reproductive-specific compound heneicosane (n-C21) and the internal standard (IS) octacosane (n-C28) are marked. Numbered peaks correspond with peaks listed in Table S1. The Inset (100X, lower left) shows an approximate 100× magnification of the n-C21 region in the chromatogram of a female worker, showing no n-C21.
