Spermatogonial stem cells: Current biotechnological advances in reproduction and regenerative medicine

Figure 3 Species differences on anatomical points for spermatogonial stem cell injection for transplantation. The transplantation procedure for spermatogonial stem cells (SSCs) is simple in the mouse. In this species, (A) there is a single efferent duct emerging from the rete testis, which is easy to cannulate to inject SSCs (arrow). In most farm animals and men (B) several efferent ducts emerge from the testis, a reason why transplantation of SSCs is often done by injection of SSCs into the rete testis (arrow) with ultrasound guidance.