Gas chromatography-mass spectroscopy profiles. (A) Total ion chromatogram of the products formed by sesquiterpene synthases (ASSs) with farnesyl diphosphate as a substrate. (B) Mass spectra of the sesquiterpenes and their authentic standards. Peak 1 is β-elemene, peak 2 is α-guaiene, and peak 3 is δ-guaiene.
Xu et al. BMC Genomics 2013 14:227 doi:10.1186/1471-2164-14-227