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CAV-2 attachment in cells preincubated with Ad5 or CAV-2 virion. HeLa cells express approximately 5 × 103 CAR molecules per cell (18), and therefore a ratio of 5 × 105 viral particles/cell was used to block CAR attachment. The data are the means of three points ± the standard deviation and are expressed as the percentages of virus attachment to control cells.
