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Results from E. coli assays. The fluorescence pulse from each microsphere was integrated and normalized by pulse width. Shown are the mean and standard deviation for the fluorescence signals from microsphere sets 50 (black), 73 (medium gray), 81 (dark gray) and 98 (light gray) for each concentration tested. Microsphere set 81 (dark gray) had anti-E.coli attached to the microspheres.
