Formation and Reduction of Indophenol Blue in Development of an Echinoderm

Abstract

The physiological patterns indicated by indophenol reaction and reduction gradients were characteristic features of echinoderm development; they could be experimentally altered in steepness and length, reversed in direction or completely obliterated in living animals, and such alterations were correlated with modifications in the course of development. It was suggested that morphological modifications were expressions of alterations in these and in other features of physiological pattern not shown by this method.