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a, Sequential assembly for biocompatible, complex microparticle array fabrication. PEGDA particles are assembled in order of size while pre-assembled particles are remained in microwells. b, c, Sequentially assembly of microparticles at proximal locations. Green particles are assembled before red particle assembly. d, Oriented assembly of Janus microparticles. Particles and microwell arrays were made of PEGDA and NOA 81, respectively.
