J. ANDREW GILLIS(See J.A. Gillis and B.K. Hall, “A shared role for sonic hedgehog signalling in patterning chondrichthyan gill arch appendages and tetrapod limbs,” Development, 2016.)
Image of the Day: Origin Story
Gill arches, situated below the eyes in this skeletal preparation of a late-stage little skate (Leucoraja erinacea) embryo, may provide clues about limb evolution in tetrapods.
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