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Infectivity titer of retroviral vector pseudotypes carrying PERV-A, PERV-C, or chimeric mutant PERV-C envelopes on human umbilical vein endothelial cells (HUVECs). Schematics of the envelopes used are shown in Fig. 1C. The infectivity titers are shown as mean blue-forming units (BFU)/ml of supernatant from triplicate samples. White bars, HUVECs; gray bars, 293HEK cells.
