Clang D, LaBaere RJ . Jacobsen syndrome: chromosome deletion at 11q23. J Am Osteopath Assoc 1998;98(10):551. doi: 10.7556/jaoa.19220.127.116.111.
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A male infant delivered at term to unrelated parents was found to have multiple dysmorphic facial characteristics, abnormal head shape, anemia, thrombocytopenia, a prominent holosystolic heart murmur with multiple cardiac defects, hypotonia, and was small for his gestational age. Karotype revealed a de novo deletion of the long arm of chromosome 11, del (11)(q23), which has been previously described as Jacobsen syndrome. Recent studies have demonstrated that a folate-sensitive fragile site at 11q, band 23, (11q23) may be responsible for this deletion and possibly other syndromes as well.
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