Increased c-myc after PCR-select subtraction. M: DNA size markers; 1-4 lanes (left): PCR products not subtracted as template, c-myc 3’ and 5’ as primers at cycles 18, 23, 28, 33; 5-8 lanes: No PCR products subtracted as template, c-myc 3’ and 5’ as primers at cycles 18, 23, 28, 33; 1-4 lanes (right): PCR products subtracted as template, c-myc 3’ and 5’ as primers at cycles 18, 23, 28, 33.