Fig. 4

Formalin-fixed paraffin-embedded serial section of PE (a, b, c, d) and DIE non bowel (e, f) stained for PGP9.5 (a, c, e) and . Original magnification × 100 (a, b) and × 200 (c, d, e, f). Picture c and d are an inset from (a) to (b) respectively. Red arrow showed nerve fibers. Nerve fibers stained with PGP9.5 were significantly different between PE and non-bowel DIE endometriosis *p < 0.041, between PE and bowel **p < 0.01 and between non-bowel and bowel *** p < 0.002 g. Nerve fibers stained with TH were not significantly different between PE and non-bowel DIE endometriosis P = 0.21, between PE and bowel P = 0.06 and significantly different between non-bowel and bowel ****p < 0.04 (h). Scale bar, 100 μm