Down, John Langdon H.(redirected from John Langdon H. Down)
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Down,John Langdon H., English physician, 1828-1896.
Down syndrome - a chromosomal dysgenesis syndrome consisting of a variable constellation of abnormalities, caused by triplication or translocation of chromosome 21. Synonym(s): Langdon Down syndrome; trisomy 21 syndrome
Langdon Down syndrome - Synonym(s): Down syndrome
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