(                                                                                                                                       Equation   11                Percentage   of   receptor   binding   (flow   cytometry)                Based   on   geometric   mean   fluorescence%   of   specific   binding=((sample   value-non-specific   binding)/(total   binding-non-specific   binding))×100Total   binding=biotinylated   PD-1   or   CD 80   only   (Hybrid   Control   at150   nM   FAC)Non-specific   binding=no   PDL 1   binding,(benchmark   2   at   150   nM   FAC))