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#4. The R represents the side chain of the amino acids which make up the anti-parallel beta sheet. Since a wide variety of side chains can exist on a beta -sheet, they generalize the structure by writing Rs instead of specific amino acid side chains.
You need to be clearer with your questions. If you're talking about inanimate or inorganic cells such as the ones your car uses then a group of cells is a battery. In terms of confinement chambers a group of cells work together to form a homely place called Prison.In Organisms/ Biology, a group of cells working together is a Tissue, a Group of Tissue's working together is an Organ, A group of Organs is a system: and systems can make up entire organisms.Source(s): A-Level Biology. NimbleNimrod Â· 9 years ago.Thumbs up.n Organisms/ Biology, a group of cells working together is a Tissue, a Group of Tissue's working together is an Organ, A group of Organs is a system: and systems can make up entire organisms. Source(s): A-Level Biology. NimbleNimrod Â· 9 years ago. Thumbs up.