Polysome or Polyribosome:
Reference: http://www.emc.maricopa.edu/faculty/farabee/biobk/polysome.gif
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Several ribosomes (string of ribosomes), collectively called a polysome or polyribosome (cluster of ribosomes, bound to a mRNA molecule)
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Ribosomes are the site of protein synthesis (simultaneously synthesizing same protein).
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Moving along an mRNA molecule at one time, several ribosomes may attach to a single mRNA and form a chain called polyribosome or polysome.
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Function independently of one another
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The ribosomes of a polysome translate the mRNA into proteins.
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For the first time, in 1963 it was discovered and characterized by Jonathan Warner, Paul Knopf, and Alex Rich.