ribosome

Noun
  1. An organelle in the cytoplasm of a living cell;
    They attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid;
    When it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell (synset 105453970)
    "the ribosome is the site of protein synthesis"

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