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Schematic of delivery system for (A) substrate-mediated delivery and (B) bolus delivery. (A) For substrate-mediated delivery, protein coatings were dried onto surfaces followed by complex immobilization for 2 h. Cells were then seeded on top of the complexes. (B) For bolus delivery, protein coatings were dried onto surfaces followed by cell seeding. Complexes were delivered as a bolus 14 h after cell seeding
