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Examples of blastocyst grading: (a) 3AA blastocyst; (b) 3AB blastocyst; (c) 3BC blastocyst; (d) 4AB blastocyst; (e) 4BB blastocyst; (f) 4BC blastocyst; (g) 5AA blastocyst; (h) 5AB blastocyst; (i) 5BC blastocyst; (j) 6AA blastocyst; (k) 6AB blastocyst; (l) 6BC blastocyst; Details of the blastocoele expansion, ICM and TE. grades were seen in Materials and methods. Bars = 50 μm
