Figure 1 (A) Photomicrograph showing an apoptotic cell in the proliferative compartment near the base of a crypt in the distal colon of a calcium treated mouse (arrow). The apoptotic cell appears within a vacuole and contains several spheres of condensed chromatin. Haematoxylin and eosin stained, x630 magnification. (B) Photomicrograph of four bromodeoxyuridine labelled cells in the proliferative compartment of a crypt in the distal colon of a calcium treated mouse. Immunoperoxidase staining, x630 magnification.