When An Arm Is Really A Leg

Flipping the X-ray showed Stefan Mundlos, MD, that his hunch was right � the patient�s arms were so odd and stiff because the elbows were actually knees.

The recent report from Dr. Mundlos� group at the Max Planck Institute for Molecular Genetics, complete with a genetic explanation for the condition, flew under the radar of the press-release-driven science news aggregators. But I noticed it because I worked on this sort of thing in grad school � flies with legs growing out of their heads.