RNA-binding protein that plays a central role in spermatogenesis. Required for meiotic entry and germline differentiation, at the transition between G2 and M phases of meiosis I. Acts by regulating translation of specific mRNAs, possibly by binding to their 3'-UTR. Essential for translation of twine (twe) mRNA. Required for the expression of various genes such as CG6784, CG17210, CG15841 scpr-B, scpr-C, and rho-6. Interacts with the translational regulator orb2. Nuclear in primary spermatocytes until near the end of the meiotic prophase and cytoplasmic localization from then onward. Testis specific. Not expressed in embryos. Expressed in larvae, pupae and adult males. Expressed during spermatogenesis. Belongs to the RRM DAZ family. Wrong choice of frame.