The structure is found in viruses but not in cells is - Capsid, made up of protein around the virus but not present in cells.
Viruses are considered non-living as these are molecules neither these are cells nor they are made up of cells. They do not have any traits of the living organism.
Cells have various cell organelles and cell structures such as cell walls, mitochondria, cell membrane, genetic material, and many more but lack protein coat or capsid around them but are made up of cells or a single cell.
Thus, the correct answer is - protein capsid.
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