Thus, in her experiments, McClintock observed several fundamental properties of chromosome biology ... 20-70 tandem copies of a simple hexanucleotide with the sequence 5'-CCCCAA-3' on one strand ...

Then, in 2006, the DNA sequence for the 24 human chromosomes was deemed "complete ... incomplete extension through homopolymers, or simple repeats of the same nucleotide (e.g., AAAAAAA).

The sequences were classified into easy-to-synthesize (blue) or difficult-to-synthesize (red). B, Graphical representations of DNA sequences: repeat, GC content, information entropy and other ...