sentence: The increase in chromatin accessibility as measured by the log of the fold change of the FAIRE signal for UNC0638 over DMSO for all H3K9me2 nucleation sites ( H3K9me2 ) as compared to the log of the fold change for FAIRE ( UNC0638 / DMSO ) for all 1 kb windows across the genome tiled in 50 bp increments ( Background ) .