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SDS polyacrylamide gel electrophoresis (SDS-PAGE) analysis under reducing conditions of solid PLGA Nanoparticles (PLGA NPs) and liquid (supernatant) fractions of different NP systems. Lane P: Protein standards; lane A: NP-BMP2 (bone morphogenetic protein); lane B: supernatant of NP-BMP2 after synthesis and encapsulation of rhBMP-2; lane C: NP after physical adsorption of BSA/rhBMP-2; lane D: supernatant after physical adsorption of BSA(bovine serum albumin)/rhBMP-2 on NP system.
