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Influence of peptide length and fluorescein linkage on FP reactivity of peptide R51. Peptides (approximately 2 nM) were incubated with a 1:100 dilution of serum in 50 mM sodium phosphate, pH 6.8, for 20 min. Peptides are shown in order of decreasing length. Black bars, strong positive PV infected (pony 95); white bars, uninfected (Petite).
