1Stachecki JJ, Cohen J, Willadsen SM. Cryopreservation of unfertilized mouse oocytes : the effect of replacing sodium with choline in the freez- ing medium [ J ]. Cryobiology, 1998,37 (4) : 346 -354.
2Menoret S, Jean M, Tesson L, et al. Optimization of cryopreservation procedures for ratembryos [ J ]. Transplant Proc, 1999,31 ( 3 ) : 1531- 1532.
3Jin B, Kusanagi K, Ueda M, et al. Formation of extracellular and intra- cellular ice during warming of vitrified mouse morulae and its effect on embryo survival [ J ]. Cryobiology ,2008,56 ( 3 ) :233-240.
