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The results of in vitro experiments (A) Neutral Red Uptake (NRU) on human dermal fibroblasts (HDF), (B) NRU on A549, (C) 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) on HDF, and (D) MTT on A549 with SWCNH and SWCNH-ox materials.
