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TUNEL of day 8 blastocysts in the IVF, SCNT, and CICT groups. Apoptotic cells were detected by TUNEL (red). Each sample was counterstained with Hoechst 33342 to visualize cell nuclei (blue). White arrows indicate apoptotic cells. Scale bar = 100 μm. TUNEL, terminal deoxynucleotidyl transferase dUTP nick-end labeling. SCNT, somatic cell nuclear transfer; IVF, in vitro fertilization. Color images available online.
