Figure 3From: On the origin of trisomy 21 Down syndromeExamples of FISH results on fetal ovarian cells using two chromosome 21-specific probes. a) Location of the probes near the end of the long arm of chromosome 21. b) Normal cell nucleus showing two dual chromosome 21-specific signals. c, d) T21 cell nuclei showing three dual chromosome 21-specific signals.Back to article page