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(a) SHERPA interaction with red blood cells. The outer membrane of the SHERPA is very flexible and allows it to change shape so as to achieve close packing with surrounding red blood cells as shown through this sequence of pictures. The only driving force for this is Brownian motion. (b) Three J774 macrophages have engulfed nearly all the fluospheres (red). No liposomes (green) can be seen inside the macrophages.
