Fig. 1

Embryo morphokinetic characterization. (A) Representative images illustrating the sequential stages of embryonic development in the time-lapse system. (1) 2-cell stage, (2) 3-cell stage, (3) 4-cell stage, (4) 5-cell stage, (5) 6-cell stage, (6) 7-cell stage, (7) 8-cell stage, (8) morula stage, (9) blastulation, i.e., the early blastocyst and blastocyst, and (10) with its distinct inner cell mass and trophoblast layers. (B) Embryo morphology. Representative image of good and poor morphological scoring throughout the embryonic developmental stages. A 2-cell-stage embryo with good (1) or poor (2) morphology; a 3-cell-stage embryo with good (3) or poor (4) morphology, a 4-cell-stage embryo with good (5) or poor (6) morphology, a 5-cell-stage embryo with good (7) or poor (8) morphology, a 6-cell-stage embryo with good (9) or poor (10) morphology, a 7-cell-stage embryo with good (11) or poor (12) morphology, a 8-cell-stage embryo with good (13) or poor (14) morphology; a blastocyst stage with good (15) or poor (16) morphology. Note that during embryonic development, not all embryos pass through all developmental stages (1–10).