Living-Cell BLI. For live-cell BLI, Huh-7/Dlk and Huh-7 cells were cultured and washed with cold PBS buffer containing 1% BSA (1% BSA/PBS). Each cell line was incubated with the probe solution containing avidin-bound antibody (25 μg) and FBP (25 μg), diluted with 1% BSA/PBS buffer at 4 °C for 120 min, and then washed three times with 1% BSA/PBS buffer. PBS buffer containing Cypridina luciferin (1 μM) was added to detect luminescence from the probes on the cell surface. Light was measured with Cellgraph™ (ATTO Co.) with 5-min exposure.