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Effect of decreased enzymatic activity of Stx1A on the inhibition of SLP. PBMC from PL BLV-positive cows were incubated with various concentrations of wild-type Stx1A (solid bars) or the site-specific mutant E167D (open bars). Cell proliferation was measured as incorporation of tritiated thymidine and expressed as counts per minute. Data are means + SE from four replicates from a representative experiment.
