Previous Article Next Article Table of Contents AAPG Bulletin, Vol.89, No.9, 1245-1250, 2005 DOI10.1306/05020504125 Export Citation Modifications of the petroleum system concept: Origins of alkanes and isoprenoids in crude oils: Reply Collister J, Ehrlich R, Mango F, Johnson G Please enable JavaScript to view the comments powered by Disqus.