Enables histone binding activity. Involved in G1/S transition of mitotic cell cycle; blastocyst development; and histone exchange. Acts upstream of or within DNA replication-dependent chromatin assembly. Located in cytoplasm and nucleus. Is expressed in several structures, including brain ventricular layer; extraembryonic component; lung; metanephros; and rest of cerebellum marginal layer. Orthologous to human NASP (nuclear autoantigenic sperm protein). [provided by Alliance of Genome Resources, Apr 2022]