Fig. 1.
Results of FISH analysis of biopsied blastomeres from preimplantation embryos using chromosome 21 (orange, white arrow) and chromosome 13 (green, pink arrow) probes. Case 1: (a) trisomy 21 (three orange signals), (b) monosomy 21 (one orange signal); Case 2: (c) normal for chromosome 21 (two orange signals), (d) trisomy 21 (three orange signals). All of the blastomeres are normal for chromosome 13 (two green signals)