Figure 2: FACS analysis of the effect of different PEG length on the binding affinity of micellar formulations towards target MCF-7 cells. MCF-7 breast cancer cells were treated for 1h with either plain micelles or phage-micelles constructed from PEG750-PE, PEG2k -PE, or PEG5k -PE conjugates, followed by FACS analysis of cell-associated micelles as indicated by an increase in red fluorescence intensity (FL2-H).