Effects of retinoic acid and lipids.

<p><b>A)</b> Representative <i>Acr</i>-GFP expression grade time-course with the addition of RA and retinol (RA, Re), lipids, and both in the medium is shown in the graph. Asterisk indicates P<0.01. <b>B)</b> Histological examination with standard H.E. staining, and immunohistochemistry with antibodies for γH2AX and Sycp1 counterstained with Hoechst. Sycp1-positive cells, indicated by arrows, were pachytene-stage spermatocytes. Scale bar: 50 γm.</p>