Mouse Sperm Cryopreservation and Effective Embryo Production Using Cryopreserved C57BL/6 Mouse Sperm Takeo, Toru and Nakagata, Naomi, Journal of Mammalian Ova Research, 27, 70-78 (2010), DOI:http://dx.doi.org/10.1274/jmor.27.70