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Immunoblotting of proteins isolated from Bifidobacterium longum ssp. longum CCM 7952 (A) and CCDM 372 strain (B). M, molecular mass marker [kDa]; line 1, protein extract of method III; line 2, protein extract of method IV; line 3, protein extract of method V; line 4, protein extracts of method VI; with human sera obtained from patients with acute Clostridium difficile. These images were taken from different blots, merged, and the appropriate scaling was used.
