ABSTRACT
Cryopreservation is a process of long-term lowtemperature storage of biological samples without morphological and functional destruction such that the samples can be recovered in an intact state. Recent advances in reproductive biology have resulted in the cryopreservation of human oocytes, zygotes, early cleavage-stage embryos, and blastocysts becoming an integral part of the human in vitro fertilization embryo transfer (IVF-ET) program.
