Supplementary Figure 3: EPFs associate with Collagen I fibers.

a–d, Immunofluorescence for Collagen I of E11.5 (a), E12.5 (b), E14.5 (c), or E16.5 (d) En1Cre;R26VT2/GK3 embryos. e-h, EPF- or ENF-signal-derived ROI mean grey value (mgv) ± SEM of the Collagen I signal from anterior or posterior regions of E11.5 (e), E12.5 (f), E14.5 (g), or E16.5 (h) En1Cre;R26VT2/GK3 embryos. n?=?3 optical fields of anterior and posterior regions at each development stage. Two-tailed unpaired t-test. * p<0.05. Scale: 50?µm. Images represent 1 out of three optical fields. The exact p values are listed in Supplementary Table 1.