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Apoptotic indexes of human HAs examined by TUNEL assay (×400). A) Positive staining of apoptotic cells in involuting phase Has. B) Positive staining of apoptotic cells in proliferating phase Has. C) The apoptotic cells were dramatically decreased in proliferating phase HAs, but increased in involuting phase HAs (P<0.01). Scale bars: 37.5 µm.
