...on the short arm of Chromosome 4 (hk4s), a large heterochromatic region outside the pericentromeres, and a euchromatic region distal to the knob. Other TDDOs range in size from 60 to 370 kb long and are present on Chromosomes 1, 2, 4, and 5 (Fig. 1B). The absence/presence of TDDO4, the largest duplication...