Figure 3From: Testicular tissue cryopreservation and spermatogonial stem cell transplantation to restore fertility: from bench to bedsideGerm line stem cells cluster in human testicular cell culture. The presence of these germ line clusters has been described previously [34, 62]. (A) Bright field; (B) scanning electron microscopy. Testicular tissue for research was obtained from transplant donors through the National Disease Research Interchange.Back to article page