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Cell apoptosis was measured using an Annexin V assay. (A) Flow cytometry results. (B) Apoptotic rate in different groups. ##P<0.01 vs. NC; **P<0.01 vs. SP-A group. SP-A, surfactant protein A; NC, normal control; FITC, fluorescein isothiocyanate; PI, propidium iodide; CRT, calreticulin.
