Figure 1 (IMAGE) Shinshu University Caption Repetitive RA treatment improves the spermatogenesis of testis pieces transplanted into the testis interstitium of germ cell-depleted mouse. Credit Copyright © 2020, Springer Nature, licensed under cc by 4.0 Usage Restrictions None License Licensed 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.