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What does 'S' refer in a 70S and 80S rib...

What does 'S' refer in a 70S and 80S ribosome?

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Term "S" refers to sedimentation coefficient or Svedberg unit as it was proposed by Svedberg. It is the measure of density and size of ribosome. It indicates rate of sedimentation of organelle in a centrifuge.
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