Supplementary Fig. 1.

Size distributions (left) and SEM images (right) of protein loaded (1% w/w) microparticles formulated from 50:50 PLGA and a PLGA–PEG–PLGA copolymer. Concentrations of the PLGA–PEG–PLGA component were varied: 0% (A and B), 10% (C and D), 20% (E and F) and 30% (G and H).