Scrape-Assisted Hatching Using Piezo Micromanipulator Inoue, Taketo and Matsushita, Yukiko and Emi, Nobuyuki and Kojima, Kenji and Ono, Yoshiyuki, Journal of Mammalian Ova Research, 26, 94-96 (2009), DOI:http://dx.doi.org/10.1274/jmor.26.94