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. 2016 May 5;21(5):590. doi: 10.3390/molecules21050590

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Intrinsic cellular autofluorescence in second-harmonic generation microscopy of endothelial cell bands (green) suspended in unpolymerized collagen type-I fibers (red) on (A,B) day 1; (C,D) day 4; and (E,F) day 10 incubation treated by ultrasound standing wave field (USWF) or sham-exposure, arrows show endothelial cell sprouts in scale bar of 50 μm, and the histograms of the occurrence frequency of collagen fiber angles in (I) USWF- and (J) sham-exposed constructs. collagen gels, courtesy of [76].