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3D volume rendering of vessel invasion at week 3 in SSite (A–C) and TriSite (D–F) hydrogels with PEGDA concentrations of 3% (A, D), 4% (B, E), and 5% (C, F) w/vol. Spheroids were stained for F-actin and imaged at 5× magnification using confocal microscopy. Color images available online at www.liebertpub.com/tea
