13 January 2009
Vol 2, Issue 53

About The Cover

Cover image expansion

COVER This week's issue features a Perspective that discusses how signaling gradients coordinate cell proliferation and cell fate determination in the developing limb bud. The image shows a skeletal preparation of embryonic mouse forelimb stained for mineralized cartilage and bone tissues (red) and unmineralized cartilage (blue). [Credit: Yingzi Yang, National Institutes of Health, USA]