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The normalized fusion rate, 
, as a function of the number of Sybs per v-SUV, 
, plotted on a semilogarithmic scale. Note the precipitous drop in 
spanning approximately two orders of magnitude as 
is decreased from 20 to 10. (Inset) Blow-up of small 
region, linear scale (72 experiments, 1609 fusion events total, 32 °C). At least 6 experiments per data point for 
, 2–14 experiments per data point for 
. Error bars are ±SEM.
