%0 Journal Article %T Characterization of concentration gradients of a morphogenetically active retinoid in the chick limb bud. %A Eichele, G %A Thaller, C %J The Journal of Cell Biology %V 105 %N 4 %P 1917 %@ 0021-9525 %D 1987-10-01 %I Rockefeller Univ Press %~ DeepDyve