関連性RBMY1F is an RNA binding protein which may be involved in spermatogenesis. It is required for sperm development, possibly by participating in pre mRNA splicing in the testis. The RBMY1 proteins are encoded by strongly repeated regions of the Y chromosome, mostly within the AZFb region. The exact number of functional copies is unclear and may vary between individuals, and some of them may represent pseudogenes. The proteins are very similar, and most experimental data does not discriminate between the different members.