Figure 3 (IMAGE) Tokyo Institute of Technology Caption Analysis of molecular isotope species of propane of natural gas samples. Arrows indicate data from simulation experiments: cultivation of propane-degrading bacteria (red) and 'cracking' (light blue). Red symbols indicate samples that have been degraded by bacteria. Credit Alexis Gilbert, Tokyo Tech Usage Restrictions The image may only be used with appropriate caption or 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.