Developing feathers
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Cross section of the rachis of another growing contour feather of a Muscovy Duck (Cairina moschata) (HE): detail
In this stage, the pulp epithelium is still present but its cells will cornify and disappear completely when the pulp inside starts to regress. By then, the rachis of the feather will have emerged out of the skin, the feather sheath cracks off and the vanes unfurl.
See also previous picture.