Fig. 2From: Models of tendon development and injuryStretch influences collagen fibril formation in an embryonic tendon model. Transmission electron microscopy images of fibrin gel tendon constructs seeded with embryonic chick metatarsal tendon cells at day 0 (T0), and after 4 days (T4) with and without stretching. Slow stretching (2 mm/day) increased collagen organization and collagen fibril packing volume in this in vitro model of embryonic tendon formation. Scale bar = 250 nm. Figure reprinted with permission by Wiley Periodicals, Inc. from Kalson et al. 2011 [56]Back to article page