TABLE 2

Number of nucleotides involved in A-tracts ≥6 bp within the AT-rich regions of the 2D8 and 105N20 repeats and the potato rDNA IGS

SequenceTotal bases% ATExp. A-tract
bases
Obs. A-tract
bases
Chi-squareP value
2D8 AT cluster 1121782.8276.016092.9<0.0001*
2D8 AT cluster 2117981.3476.115479.8<0.0001*
105N20 AT cluster206582.96115.5305310.9<0.0001*
Potato IGS36779.5617.35373.6<0.0001*
  • * Significant difference (P ≤ 0.01) between observed and expected frequencies of ACS-related elements.