Quantitative Trait Loci (eQTL) (IMAGE) NIH/National Human Genome Research Institute Caption Sections of the genome, known as expression Quantitative Trait Loci (eQTL), work to control how genes are turned off and on. Credit Darryl Leja, NHGRI Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.