FOLR1 and ovarian carcinoma: While conventional v9 × Farl biAb bound both CD3+ FOLR1– human T-cell line Jurkat and FOLR1+ CD3– human ovarian cancer cell line IGROV-1 as determined by flow cytometry (Figure S2A), v9 × h38C2 biAb only bound Jurkat cells (Figure 2A).