Ki67, p53 and ALDH1 immunoreactivity in fallopian tube; left column, after treating with tamoxifen; center column, after treating with clomid; right column, untreated control group. a-c) Immunoreactivity for Ki67; note the moderate expression of Ki67 in the tubes exposed to tamoxifen and clomid, and the low expression in the control group. d-f) Immunoreactivity for p53; the expression of p53 is weak in the tubes exposed to tamoxifen and clomid, and not present in the control group. g-h) ALDH1 immunoreactivity; note the strong expression of ALDH1 in the tubes exposed to tamoxifen and clomid, and the low or absent expression in the control group; also note the on/off effect of ALDH1 expression in panel h, where ALDH1 is mainly detected in the secretory cells lining but not in the ciliated cells. Scale bars: 100 µm.