A monounsaturated fatty acid; the isomer of oleic acid and trans isomer of petroselinic acid; has been found in cow, goat, and ewe milk fat as well as human breast milk; increases cellular content of triacylglycerols and cholesterol esters and upregulates transcription of genes involved in fatty acid synthesis, including SREBP-1c, ACACA, FASN, and SCD1, and cholesterol synthesis, including HMGCR, HMGCS1, FDFT1, and SREBP-2, in HepG2 cells at 100 μM