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Cover Figure


COVER Mouse zygotes that are developing parthenogenetically (without fertilization) with a single polar body and two pronuclei. These zygotes develop into blastocysts, from which embryonic stem cells can be harvested. Such cell lines can provide a source of immunologically compatible tissues for transplantation. Zygote outer diameter, 70 to 80 micrometers. See page 482. Image: K. Kim, K. Ng, A. Yabuuchi, and G. Q. Daley

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Science. ISSN 0036-8075 (print), 1095-9203 (online)