Fig. 2

Gaps between basal cells develop soon after wounding (A–D) Electron micrograph xz planes of 3-dpf epidermis before wounding (A) or at various times after wounding (B–D). Each micrograph is accompanied by a camera lucida drawing to guide the eye. Coloring of camera lucida drawings matches that in Figure 1Aii; the cell shown in green (D) has a nuclear morphology consistent with that of an immune cell. Gaps between cells emerge as early as 2 mpw, coalesce by 7 mpw, and by 20 mpw they appear at cell-cell junctions at the interface between superficial and basal cells. White arrowhead in (B): superficial cell further away from the wound retains the flat apical surface and curved basal surface seen in unwounded cells. Black arrowhead in (B): superficial cell closer to the wound has an inverted shape, with a curved apical surface and a flattened basal surface.