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GM1A was sequentially treated with bovine β-galactosidase (β-Gal) and then N-acetylgalactosaminidase (N-AG). The ability of purified pH 6 antigen to bind to the products of enzymatic treatment, i.e., GM2A and LC, was determined by ELISA, and results were compared with the binding of the pH 6 antigen to GM1 and GM1A. Results are means ± standard errors of duplicates.
