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Morphology of bovine IVF embryos produced from thawed sperm obtained from an extinct JBC bull (BK94-13; A, C and E) and a post-death cloned bull (Heuk Oll Dolee; B, D and F). There were no differences in morphology between the two at 2 (A and B), 6 (C and D) and 8 (E and F) d, respectively. Bars, 200 µm.
