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Identification of human periodontal ligament fibroblasts (HPLFs). (A) Vimentin expression in HPLFs. Vimentin was found in the cytoplasm with a yellow-brown color. Original magnification, ×200. (B) Keratin expression in HPLFs. Keratin was not found in HPLFs. The results proved that HPLFs are mesenchymal cells derived from the embryonic mesoderm. Original magnification, ×200.
