PRM1 and Infertility: Similarly, the post-meiotic spermatid marker PRM1 (which indicates chromosome condensation) was evidently expressed after SCCM induction at day 19 of culture (p = 0.02), as shown in (Figure 10E-F), its slight expression was also observed in the RA group on infertile donor treated AD-MSCs 19 days after culture (Figure 10F).