Antiserum was prepared in sheep against insoluble elastin isolated from embryonic-chick aortae. In an indirect immunoprecipitation test, the antiserum reacted quantitatively with small amounts of radioactively labelled purified tropoelastin prepared from embryonic-chick aortae. The antiserum did not cross-react with chick procollagen, and the antiserum uas used to identify radioactively labelled tropoelastin secreted by chick aorta cells in suspension culture.

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