– Sperm protein 17 (Sp17) is a highly conserved mammalian protein characterized in rabbit, mouse, monkey, baboon, macaque, human testis and spermatozoa. mRNA encoding Sp17 has been detected in a range of murine and human somatic tissues. It was also recognized in two myeloma cell lines and in neoplastic cells from patients with multiple myeloma and ovarian carcinoma. SP17 Protein, Human, Recombinant (His) is expressed in E. coli expression system with N-His tag. The predicted molecular weight is 18.50 kDa and the accession number is Q15506.