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. 2016 Sep 30;6:34334. doi: 10.1038/srep34334

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Copyright © 2016, The Author(s)

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Short length PEG (short); medium length PEG (Medium); long length PEG (Long); 3 and 10 times non-reactive PEG diluted short length PEG, short (1:3) and Short (1:10), respectively; coupled silicon wafers at 50, 150, 300, 600 and 1200 ms exposure time under 63 x oil lens. Histogram bars represent mean ± s.e.m for three experimental repeats.