We have been able to show that the site of hemoglobin synthesis in vivo is not the single ribosome but rather a cluster of ribosomal particles, which we have called a ‘polyribosome’ or simply a polysome.
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polysomePolysom (ger.)
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A cluster of ribosomes held together by a strand of messenger RNA which each ribosome is translating. Also called polyribosome. (OED 2011)
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Warner, J.R., Rich, A. & Hall, C.E. (1962). Electron microscope studies of ribosomal clusters synthesizing hemoglobin. Science 138, 1399-1403: 1399.