Effect of cadmium exposure on porcine blastocyst quality. (A) Representative images of CDX2 staining of blastocysts. Bar = 100 µm. Quantification of the (B) inner cell mass and (C) trophectoderm cells (n = 33 per group). (D) Representative images of TdT-mediated dUTP nick-end labeling of blastocysts. Bar = 100 µm. Quantification of (E) total cells, (F) apoptotic cells, and (G) apoptosis rate (n = 30 per group). Values with different superscript letters (a and b) differ significantly (p < 0.05). Data are compiled from three independent experiments.