Fig. 3. Counts of BrdU-ir cells in the basal (A) and mid-apical (B) cell layers of the olfactory epithelium of T₃-implanted (black bars) and placebo (gray bars) fish. Clustered and individual cells are considered separately in the first two columns, and together in the third column (`total cells'). Values are expressed as means ± S.E.M. Mann-Whitney U-tests: ^*P<0.05; ^**P<0.025.