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(A) Karyotype of polyclonal line hTERT-poly with isochromosome 21q (arrow). (B) Tetraploid karyotype of monoclonal immortalized line K#4. (C) Karyotype of monoclonal line K#1 showing an extra Chromosome 17 (circled) as observed in 6/15 recorded images. (D) Normal diploid karyotype of immortalized monoclonal line K#1 as observed in 9/15 recorded images.
