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Analysis of AgB preparation. AgB‐enriched fraction was subjected to 4%‐20% SDS‐PAGE under reducing conditions and stained with Coomassie blue (left part) or transferred to nitrocellulose paper and incubated with a serum from a person with cystic echinococcosis (right part). AgB: antigen B‐enriched fraction; Mw M, prestained standard of molecular weight markers
