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Hemadsorption (HAd) activity of HN interface mutants. The ability of the HN interface mutants to hemadsorb guinea pig erythrocytes was determined by incubation for 30 min at either 4°C or 37°C. The background level obtained with monolayers expressing vector alone was subtracted, and the data are expressed as a percentage of the amount obtained with wild-type (wt) HN-expressing monolayers. The data shown represent the means from at least four determinations.
