Fig. 2.

Length three fragments produce less significant p-values than fragments of length four through six. The motif p-values for fragments of length three residues (a), four residues (b), five residues (c), and six residues (d) are shown as histograms with motif p-values on the x-axis and the number of fragments on the y-axis. This data comes from a test set of 74 GenBank searches from six diverse SFLD protein superfamilies