epididymal sperm binding protein 1|The protein encoded by this gene belongs to the sperm-coating protein family of epididymal origin. This protein and its canine homolog are the first known examples of proteins with four tandemly arranged fibronectin type 2 (Fn2) domains in the Fn2-module protein family. [provided by RefSeq, Jul 2008] (NCBI Entrez Gene Database, 64100)