Judged: two independent readers; copy check clear.
trisomy 13
trisomy 13 Trisomy 13 is a chromosomal abnormality in which there are three copies of chromosome 13 genetic material instead of the usual two.
Trisomy 13 is a chromosomal abnormality in which there are three copies of chromosome 13 genetic material instead of the usual two. It is associated with multiple developmental and physical abnormalities, including intellectual impairment, microcephaly, low-set ears, eye structure defects, extra fingers or toes, and limb abnormalities.