Figure 4.

Electron microscopy analysis of the epididymis of infected macaques (x100). Premature sloughing of immature germ cells (spermatocytes and spermatids, arrows) into the epididymal lumen of some pre-pubertal SIV and SHIV infected macaques (panel B), a pattern that was distinct from that of the epididymal lumen of other mature macaques (panel A). ES: elongated spermatids; IGCs: immature germ cells.