Offspring Derived from Intracytoplasmic Injection of Sonicated Rat Sperm Heads Nakai, Michiko and Saito, Eri and Takizawa, Akiko and Akamatsu, Yoko and Koichi, Maiko and Hisamatsu, Shin and Inomata, Tomo and Shino, Masao and Kashiwazaki, Naomi, Journal of Mammalian Ova Research, 22, 159-162 (2005), DOI:http://dx.doi.org/10.1274/jmor.22.159