highly significantP ≤ 0.01
These differences are highly significant for all motif classes (ANCOVA on distributions in the range 20–70 bp, all P ≤ 0.01), except for penta- and hexanucleotides due to a lack of power( F 4,50 = 1.08, P = 0.376 , F 4,35 = 0.223, P = 0.923 ).