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In contrast to the normal (46, XX) karyotype of UROtsa cells [3], [5] the UROtsa-3/T24 stock had a median of 80 chromosomes (early passage). Shown is the distribution of chromosomes for an early (P5, week 3; orange) and a later passage (P39, week 32; red). The normal chromosome numbers of authentic UROtsa could be confirmed for the UROtsa-2 (not shown) and UROtsa-4 stock (green).
