... an intrinsic signal that serves to maintain growth cone primacy and conserve cellular material. * Author for correspondence (e-mail: [email protected]) 26 07 1999 27 09 1999 © 1999 by Company of Biologists 1999 Growth cone collapse Axon guidance Substratum...

... marginal cells showed autonomous migration on FN-coated substratum at the same time as the onset of gastrulation in control embryos. They acquired this capacity at least at the 32-cell stage, whereas lateral and ventral marginal cells acquired it after the 64-cell stage. DMZ outgrowths of early gastrula...