Binds the stem-loop structure of replication-dependent histone mRNAs. Is associated with translationally inactive histone mRNA stored in oocytes. Could be a specific translational repressor. Not involved in histone pre-mRNA processing. Binds the stem-loop structure of replication-dependent histone mRNAs. Is associated with translationally inactive histone mRNA stored in oocytes. Could be a specific translational repressor. Not involved in histone pre-mRNA processing. Oocyte. Detectable in stage I oocytes, increases through stages III and IV, then slightly declines as the oocytes mature to stage VI. Present in early embryogenesis until midblastula transition, at which point it becomes undetectable. Belongs to the SLBP family.