Extended Data Fig. 3: Effect of collagen pre-alignment on fibroblast morphology.

Representative image selected from over 30 cells imaged in a collagen ECM with an initial cell density of 2×104 cells/ml. When cultured within a pre-aligned collagen matrix, fibroblasts predominantly aligned with the collagen fibres and elongated in that direction. Green: collagen (confocal reflectance); Blue: nuclei (DAPI); Orange: tubulin. Scale bar: 50 μm.