Tomatoes (IMAGE) Howard Hughes Medical Institute Caption After centuries of breeding, tomatoes now take all sorts of shapes and sizes, from cherry-like to hefty heirloom fruit. Scientists are teasing out at the level of genes how and why these physical changes show up. Credit Lippman Lab/CSHL/HHMI Usage Restrictions Must use credit. 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.