Derivation of Two New Human Embryonic Stem Cell Lines from Nonviable Human Embryos

Table 1

Quality scores of 915 embryos graded B (blastocysts) or HB (hatching blastocysts) on ED6 and deemed unsuitable for clinical use.

	ED6 ICM/TE score^a
ED6 grade	AB	BB	BC	BD	CB	CC	CD	DB	DC	DD	Total
Good	1										1
Fair		5	1		2	4		1	1	1	16
Poor			1	2	3	223	113	20	76	460	898
Total	1	5	2	2	5	227	113	21	77	461	915

^aThe first letter represents the quality of the ICM and the second letter the quality of TE.