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Hum Genet. 1979 Jan 19;46(1):1-4.

Variable substructure in the secondary constriction of the human chromosome 1.


The secondary constriction in human chromosome 1 consists of a proximal segment stained by the GC-specific fluorochrome mithramycin and a distal segment stained by such fluorochromes as DAPI or DIPI, which show enhanced fluorescence intensities in AT-rich regions of the chromosomes. A study involving 21 individuals revealed that both parts are independently involved in length variability. In two cases, two GC-rich regions separated by an AT-rich segment and an additional distal AT-rich part were found.

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