Effects of In Vitro Aging of Mouse Oocytes on Metaphase II Spindle Morphology, In Vitro Fertilization and Subsequent Embryonic Development Takahashi, Kazumasa and Matsui, Hitomi and Takahashi, Ikue and Matsumoto, Hiromichi and Fukui, Emiko and Motoyama, Mitsuhiro and Yoshizawa, Midori, Journal of Mammalian Ova Research, 27, 42-50 (2010), DOI:http://dx.doi.org/10.1274/jmor.27.42