Testis morphology in Eno4Gt/Gt mice. A) Hematoxylin and eosin staining in testis of Eno4Gt/Gt mice. Lobular structures (arrows) were observed along lumen of testis of Eno4Gt/Gt mice. Bar = 25 μm. B, C, and D) Testes were fixed, sectioned, and examined by TEM. Sagittal section (C) and cross section (D) of sperm flagellum are shown. LC, longitudinal column; R, ribs of FS. Bars = 1 μm.