精子冷冻保存 Vitrification of a small number of spermatozoa in normozoospermic and severely oligozoospermic samples 作者 生殖保护 发布于 2017年12月8日 3408 阅读 Abstract Despite broad utilization of sperm cryopreservation, little progress has been made to modify freezing protocols or to improve rates of sperm survival. Vitrification is an alternative method for freezing human sp 阅读全文