Fig. 6From: Interplay between nitric oxide and gonadotrophin-releasing hormone in the neuromodulation of the corpus luteum during late pregnancy in the ratGanglionic effect of L-NAME on luteal apoptosis assessed by TUNEL. Representative micrographs of CL histological sections corresponding to control group (A), L-NAME group (B), positive control of the technique (C), and negative control (D). Arrows indicate positive TUNEL brown apoptotic nuclei. Contrast coloration: Hematoxylin, total magnification X400. Bar scale: 25 μm. E Apoptosis levels expressed as percentage of TUNEL positive cells. Values represent the mean ± S.E.M of 4 animals per experimental group. Mann-Whitney test: (*) P < 0.05Back to article page