MRI Image of Tarantula (image) Society for Experimental Biology Caption Scientists can color the MRI images to highlight organs. The heart is shown in lighter colors in the posterior part of the body. Credit Gavin Merrifield Usage Restrictions None 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.