Experimental Biological Chemistry Class (IMAGE) American University Caption Students in American University's experimental biological chemistry class analyze reaction products on a GC-MS (gas chromatograph-mass spectrometer). Credit Matt Hartings/American University Usage Restrictions Appropriate 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.