Latest analysis shows that human limbs share a genetic programme with the gills of cartilaginous fishes such as sharks and skates, providing evidence to support a century-old theory on the origin of limbs that had been widely ...
Evolution
Apr 19, 2016
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(Phys.org)—A small team of researchers with affiliations to the University of Florida and Howard Hughes Medical Institute has found that clasper development in skates is controlled by hormones that regulate the Sonic hedgehog ...
(Phys.org) —Stem cells switch off and on, sometimes dividing to produce progeny cells and sometimes resting. But scientists don't fully understand what causes the cells to toggle between active and quiet states.
Cell & Microbiology
May 9, 2014
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In most tetrapods (land vertebrates) the fourth (ring) finger is the first to develop in the embryo. And in birds, the finger on the outside of the hand (posterior, the pinky side) appears first, which suggests that this ...
Plants & Animals
Jan 7, 2014
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Scientists from the University of Wisconsin, USA, report in the journal Development the successful generation from human embryonic stem cells of a type of cell that can make myelin, a finding that opens up new possibilities ...
Cell & Microbiology
Apr 9, 2009
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