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Weekly BSA release from microspheres formulated with (A) 7–17 kDa, 50:50 PLGA, (B) 24–38 kDa, 50:50 PLGA, (C) 38–54 kDa, 50:50 PLGA, and (D) 4–15 kDa, 75:25 PLGA containing 0.5, 3, or 5% BSA by weight. All data normalized to the total amount of protein recovered throughout the experiment. Error bars represent standard deviation.
