PLAUR and melanoma: To verify the specificity of these binders to uPAR expressed on the cell surface, the surface expression of uPAR on parental 293T cells, 293T cells isogenically expressing uPAR (293T-uPAR), or A375 cells (human melanoma cell line intrinsically express uPAR) were verified by a commercial anti-human uPAR antibody.