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In vitro cytotoxicity of silk nanoparticles in macrophages. RAW 264.7 cells were exposed for 48 h to 2.5–250 μg mL–1 nanoparticles prepared from 10-, 30-, 60-, or 90-min degummed silk. Nanoparticles were manufactured using either a (A) manual or (B) microfluidic method. (n = 3).
