P9 and P28 patterns co-localize. (A) Cross-correlation analysis of the loci where P9 and P28 patterns occurred. Taking all sites together, two preferential locations of the centers are found (blue). By separating the locations of the peaks of 28 based on the strand on which the 19-mer contributing to the P28 pattern occurred, the two peaks were disentangled. For black we used P28 patterns in which the short sequence was found on the plus strand. For red we used P28 patterns in which the short sequence was found on the minus strand. (B) Triplex configurations that give rise to the co-occurring P9 and P28 peaks. (C) Venn diagram summarizing the co-occurrence of P9 and P28 processing patterns.