Abstract
This study uses histochemical methods to determine the ultrastructural distribution of specific glycosaminoglycans (GAGs) during the development of blood vessels in the chick chorioallantoic membrane (CAM) and to correlate changes in GAG composition with the significant structural events in the development of these vessels. Tissues were stained with tannic acid, ruthenium red, and high iron diamine and digested in various GAG-degrading enzymes to identify specific GAGs. The results are consistent with a role for hyaluronic acid in the formation, alignment, or migration of the capillary plexus of the CAM and a role for sulfated GAGs (heparan sulfate, chondroitin sulfate, dermatan sulfate) in the differentiation and development of arterial and venous vessels of the chorioallantoic membrane.
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