Each tissue and cell type has a unique pattern of fatty acid composition in its membranes determined by the cell's role in metabolism and its need for specific physical characteristics.

“I would venture to say that there is a unique suite of fatty acids a unique pattern of fatty acid for air every type of tissue and every cell it's not the same anywhere they're all a little bit different and that's because the body and the way that the wisdom of synthesizing cells each cell has its own role to play in metabolism the membrane has to have certain physical characteristics being real loose and floppy or being real stiff depending on the need of that cell and the fatty acid composition is unique to afford a certain kind of chemical the flexibility”