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Infection results with GALV- and FeLV-B-enveloped retrovirus vectors on MDTF cells stably expressing Pit1, Pit2, or Pit1 chimeric or mutant receptors. Bars, schematic representations of receptors (white, Pit1; black, Pit2). Residue positions of mutations or substitutions are indicated. The titers from at least three independent experiments were averaged and are expressed as mean numbers of β-galactosidase-expressing cells.
