Abstract
1. 1. The induction of chick vertebral cartilage by spinal cord and notochord was studied in tissue culture with the use of radioactive sulfate. The incorporation of radioactive sulfate into the induced cartilage was used to detect the formation of sulfated polysaccharides. 2. 2. Chondroitin sulfate(s) were extractable from the cultures only when a distinguishable cartilage matrix was present. It was confirmed that in the absence of an inducing agent (spinal cord or notochord), somites formed neither cartilage nor any characteristic macromolecular constituents of cartilage (collagen and chondroitin sulfates). 3. 3. Chondroitin sulfate(s) were the only acid polysaccharides present in the induced cartilage. Keratosulfate, in addition to chondroitin sulfate, is detected in older chick vertebral cartilage. The presence of chondroitin sulfate was detected independently by analysis for uronic acid.
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