Genomic frequencies of various prokaryotic oligonucleotides and their mismatched forms showing signs of gradual drive or drag towards genomic over- or underrepresentation.

Seqexp: Expected number of sequences, Seq0bs: Observed number of sequences, χ2: Goodness of fit Chi-squared, and Repseq: Sequence representation (equation 2). Significant values are underlined. Positive values mean overrepresentation, whereas negatives mean underrepresentation (equation 3).