However, odor discrimination (measured by the discrimination index as in Figures 1, 2, and 4D) was as enhanced as in GluR-BΔFB mice (0.79 ± 0.05, mean ± SEM compared with 0.76 ± 0.02, p > 0.7, Figure 6C), and improved relative to GluR-B2lox controls (0.48 ± 0.06; Figure 6C; overall ANOVA: F(2,41) = 17.2, p < 10−5; post hoc Newman Keuls: p < 10−3), as expected if the enhanced discrimination phenotype is due to Ca2+-permeable AMPARs in the olfactory bulb and unaffected by GluR-B expression in piriform cortex or hippocampus.