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Infection by virions expressing targeting envelopes. Virions were used to infect CHO cells expressing Pit-2 receptor (CHO–Pit-2 cells; white bars), mCAT-1 receptor (CeRD9; gray bars), or both receptors (CeAR13; striped bars). Data correspond to the average of 20 repeats (each duplicate), and no significant difference from one experiment to another was observed (standard deviation of 0.25 log, 99% confidence interval of the mean).
