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. 2013 Mar 4;110(12):4616–4621. doi: 10.1073/pnas.1218318110

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Fig. 4. — Characteristics of sperms in the Arid4a^−/−Arid4b^+/− epididymis. (A) Sections of epididymis from wild type (a and b) and fertile Arid4a^−/−Arid4b^+/− (c and d) males at 2 mo of age were stained with H&E. High magnification is shown in b and d. Arrowheads indicate round spermatids inside epididymal lumens of Arid4a^−/−Arid4b^+/− mice (d). (B) H&E-stained epididymis sections from a wild-type male (a and b) and two infertile Arid4a^−/−Arid4b^+/− males (c–f) at 10 mo of age. High magnification is shown in b, d, and f. Arrowheads indicate round spermatids (d). (C) Sperm count from wild-type males, fertile Arid4a^−/−Arid4b^+/− males, and infertile Arid4a^−/−Arid4b^+/− males at 2 and 10 mo of age. Sperms were collected from the epididymides of each mouse. Spermatozoa containing both a head and a tail were counted. Counts were obtained from at least three mice per genotype at the indicated age.