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termination, and ribosome recycling. The start codon in all mRNA molecules has the sequence AUG. The stop codon is one of UAA, UAG, or UGA; since there are no tRNA molecules that recognize these codons, the ribosome recognizes that translation is complete. When a ribosome finishes reading an mRNA molecule, the two subunits separate and are usually broken up but can be reused. Ribosomes are a kind of enzyme, called ribozymes because the catalytic

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