Fig. 2. The number of strands parallel to the plane of the monolayer and the depth of the junctions increased between E10 and E14. The patches of strands evident on E7 were compared with the junctional networks of E10 and E14. The number of strands and the junctional depth (distance between the apical- and basal-most strands) increased during the intermediate phase of development to form a homogenous structure.