|As an egg cell develops, a process called polarization controls what parts ultimately become the embryo's head and tail. This picture shows an egg of the fruit fly Drosophila. Red and green mark two types of signaling proteins involved in polarization. Disrupting these signals can scramble the body plan of the embryo, leading to severe developmental disorders. Courtesy of Wu-Min Deng, a developmental biologist at Florida State University.
Featured in the September 19, 2006, issue of Biomedical Beat.
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