<prompt> Prostaglandins areMonounsaturated fatty acidsPolyunsaturated fatty acidsEicosanoidsSaturated fatty acids  <response>: Unsaturated Fatty Acids Contain One or More Double BondsUnsaturated fatty acids may be further subdivided as follows:Monounsaturated monoethenoid, monoenoic acids, containing one double bond.Polyunsaturated polyethenoid, polyenoic acids, containing two or more double bonds.Eicosanoids: These compounds, derived from eicosa 20-carbon polyenoic fatty acids, comprise the prostanoids, leukotrienes LTs, and lipoxins LXs. Prostanoids include prostaglandins PGs, prostacyclins PGIs, and thromboxanes TXs.HARPERS ILLUSTRATED BIOCHEMISTRY30th ed, Page No:213 