Abstract:Morphological variations due to heterochromatic DNA of the secondary constriction region (qh) of human chromosome 1 are considered normal. The presence of a G-negative band within the qh region of chromosome 1 has been considered as a rare or unusual variant. The aim of the present study was investigated the role of G-negative band that embedded within the secondary constriction region of chromosome 1 in two cases. Both cases were unrelated and two different family. First family history was three postnatal los… Show more
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