WWP2 N-terminal-like (WBP2NL), also known as post-acrosomal sheath WW domain-binding protein (PAWP), is a testis-specific protein localized in the post-acrosomal sheath of spermatozoa []. The WBP2NL protein enters the oocyte during fertilization, and induces meiotic resumption and oocyte activation events [, ]. It may be associated with cellular proliferation and tumourigenic processes [, ].
