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(a) Chemical structure of amphophilic PPDEs. (b) Amphiphilic polyphosphodiester copolymer [CH-P(EPx/EEPy)]-immobilized 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) vesicles. Scale bar represents 500 nm. (c) Poly L-lactic acid nanoparticles bearing amphiphilic poly(ethylene sodium phosphate) (CH-PEP·Na). Scale bar represents 200 nm. (d) Bovine serum albumin/CH-PEP·Na conjugates. Scale bar represents 200 nm.
