The histone methyltransferase Setd2 is required for expression of acrosin-binding protein 1and protamines and essential for spermiogenesis in mice — Setd2 is crucial for spermatogenesis — The histone methyltransferase SETD2 is required for expression of acrosin-binding protein 1 and protamines and essential for spermiogenesis in mice — SETD2 is crucial for spermatogenesis