Fig. 3.
. Stage 11 embryos were irradiated with 0 (–IR) or 570 rad (+IR) of x-rays before fixing and staining with an anti-PH3 antibody to visualize mitotic cells. Quantification of PH3-stained cells in the dorsal epidermis (shown enclosed by brackets) from similar embryos show a reduction in mitoses in irradiated embryos.