Figure 4: Localization of β-catenin in different mouse epididymal regions during postnatal development. The ages (expressed in days (d)) are shown on the left, and the regions of the epididymis are shown at the top. Scale bars, 40 μm. Negative controls with rabbit IgG instead of primary antibody were done in all regions but only shown for the caput region. Representative epididymal sections from one of the three mice. IS: initial segment; ED: efferent ducts.