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Competitive inhibition of hLf binding to S. pneumoniae serotype 3 (NCTC 7978) by a purified type 25 PspA cloned from S. pneumoniae ATCC 11733 (serotype 2). The binding assay was performed with 125I-labelled hLf in the presence of increasing concentrations of the 32.1-kDa purified PspA protein (QP2). Values shown are the means of triplicate determinations.
