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(A) Or and (B) Gr gene expression in honey bee olfactory and gustatory organs measured as fold increases relative to levels in the body as a reference tissue using the 2−ΔΔCT equation (Livak and Schittgen 2001). Gene expression levels were determined by real-time quantitative PCR and normalized to levels of A. mellifera ribosomal protein S8 (GenBank accession NM001011604).
