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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: Biomaterials. 2010 Aug 16;31(33):8642–8650. doi: 10.1016/j.biomaterials.2010.07.085

Figure 2. Gradient formation.

Figure 2

(a) Microspheres with the same chemical structure but with different densities were produced from PEG precursors labeled with different fluorescent dyes. The microspheres were suspended in 10% serum and added to a PLL-g-PEG treated Pasteur pipette. (b) The microspheres were initially well mixed. (c) Upon centrifugation, the microspheres separated based on their relative densities.