During development, communication between organs determines their relative final size.
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Collective cell migration relies on a directional signal that comes from the moving cluster, rather than from external cues.
Watch the cell transplant experiments in zebrafish that suggest certain embryonic cells rely on intrinsic directional cues for collective migration.
In the final chapter of his book on the origins of vertebrate sex, author and paleontologist John Long pays homage to the humble placoderm, which got the erotic ball rolling.
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| January 1, 2013
Meet some of the people featured in the January 2013 issue of The Scientist.
The science images and videos that captured our attention in 2012
New analyses of fossils found in the 1930s suggest that a labrador-sized biped lived around 243 million years ago, potentially making it the oldest known dinosaur.
New noninvasive methods of selecting the most viable embryo could revolutionize in vitro fertilization.
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| November 1, 2012
Meet some of the people featured in the November 2012 issue of The Scientist.
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