Figure 4. SIM GC/MS analysis of methyl esters (DMDS adducts) for ions 217 (9) and 245 (11) m/z. Top: control elo1 yeast cells transformed with pYES2 only and incubated with MAME exhibit normal Z9-unsaturated acids. Bottom: Elo1 yeast cells transformed with pYES-Cro-PG and incubated with MAME produced Z/E11-14:Acids as new products.