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Susceptibility of MDTF cells expressing FLVCR1, FLVCR2, or FLVCR1/FLVCR2 hybrid or mutant constructs to lacZ(FeLV-C). These structures are hypothetical based on hydrophobicity algorithms. Titers are the averages of three independent experiments. The potential extracellular loops are numbered above FLVCR1. Proteins that were not expressed on the cell surface are represented by asterisks.
