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The Cell Membrane is a Fluid Mosaic. A cell is the basic unit of life, and all organisms are made up of one or many cells. One of the things that all cells have in common is a cell membrane. It is a barrier that separates a cell from its surrounding environment. This outer boundary of the cell is also called the plasma membrane.
So, today's modern discoverers of the fluid mosaic, phospholipid bilayer cell membrane are S. Jonathan Singer and Garth L. Nicolson. But they stand at the forefront of a long history of research on the existence, and anatomy, of the boundary of the cell.