The Effect of Cryopreservation on the Sperm Ultrastructure of Mus Musculus Albinus Strain DDY: Comparison of Nakagata vs Modified vs Kitazato Cryoprotectants, Larasati, Manggiasih Dwiayu, Lestari Silvia W., Pangestu Mulyoto, Hestiantoro Andon, and Kusmardi Kusmardi , Pharmacognosy Journal, June 2024, Volume 16, Issue 3, p.563-569, (2024)