Tomato KLUH Weight (IMAGE) Cold Spring Harbor Laboratory Caption Increasing the number of copies of the gene KLUH increases the weight of tomato fruits. The tomatoes on the left have three copies of KLUH and the ones on the right only one. Credit Lippman lab/CSHL, 2020 Usage Restrictions Attribution needed 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.