Philipp Keller, Bill Lemon, Yinan Wan, and Kristin Branson, Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, Va.
Just 22 hours after fertilization, this zebrafish embryo is already taking shape. By 36 hours, all of the major organs will have started to form. The zebrafish's rapid growth and see-through embryo make it ideal for scientists studying how organs develop.
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