Neonatal testis organoids sertoli germ cells (IMAGE) Bar-Ilan University Caption Testicular organoids generated from mice pups and incubated in a dish for 21 days. Sertoli cells, which are the cells responsible for the formation of the tubules in the testicle, appear in red and germ cells, which will produce the sperm cells, appear in green. Germ cells always stay close proximity to Sertoli cells as they support them during the formation of sperm cells. Credit Aviya Stopel Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.