Mitotic disturbances: about causality and terminology.
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Biomedical subjects
Publications and source records attributed to Y Chamla.
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Different cases in which chromosomes obtained from short-term lymphocyte cultures appear with separated centromeres are reviewed. These include: (1) C-anaphases in the colchicine-resistance mutation, (2) C-anaphases as a common variant, (3) premature centromere division (PCD) in elderly women, (4) PCD in Alzheimer's disease, (5) early splitting and puffing of centromeres in Roberts' syndrome.
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A new case of partial trisomy 9q was found in a child presenting two de novo aberrations: a deletion of the long arms of 9 and a 9,21 translocation. A tentative cytogenetic explanation is put forward.
A modified thermal denaturation of human chromosomes in Hanks' solution at 91 degrees C produces highly contrasted C and T bands. This improved double-banding system is a good tool in the analysis of ring chromosomes, for which R banding is often inadequate, as it is exemplified.