beta n acetylhexosaminidase human 8 human cell 8 male 8 Hexosaminidase 4 Spermatozoa 4 Western blotting 4 article 4 controlled study 4 electrophoresis 4 enzyme activity 4 epididymis 4 fertilization 4 glycoprotein 4 human tissue 4 molecular weight 4 nonhuman 4 priority journal 4 semen analysis 4 seminal plasma 4 zona pellucida 4 Acetylglucosaminidase 2 Aged 2 Aged, 80 and over 2 Animalia 2 Article 2 CD52 antigen 2 CHO cell 2 Chromatography, Gel 2 Chromatography, High Pressure Liquid 2