Quantitative PCR analysis for relative expression of ORs. In β3GnT2−/− mice the expression of mOR256-17 (Olfr15), mOR125-1 (Olfr43), and mOR256-7 (Olfr136) increased while that of mOR13-4 (Olfr640), mOR16 (Olfr1264), and mOR28 (Olfr 1507) decreased compared to WT mice. Results are the average relative value of three animals normalized to an RNA polymerase 2 reference target. Statistics: Student’s t test, **P < 0.001. * < 0.05; mean ± SEM (n = 3).