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. 2021 Mar 8;12:586220. doi: 10.3389/fimmu.2021.586220

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Copyright © 2021 Phillips, Garciafigueroa, Engman, Liu, Wang, Lakomy, Meng, Trucco and Giannoukakis.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Physical characteristics of the PLGA-Ni microparticles. (A) Fluorescence microscopy image of His-tagged GFP admixed with PLGA-Ni microparticle suspensions. Autofluorescence has been subtracted from the image. Scanning electron microscopy images of PLGA-Ni without (B) and with (C) adsorbed TGFβ1. (D) A histogram of hydrodynamic microparticle size of PLGA-Ni alone or with His-tagged TGFβ1, reveals hydrodynamic diameters (D_h) of 867.5 ± 41.6 nm (PDI = 0.18) and 1,088.6 ± 15.6 nm (PDI = 0.15), respectively.