Messenger RNA travels through the cytoplasm until it reaches a ribosome. It then delivers its information, but there's one more step. Ribosomes don't speak mRNA, and must call in their translators: transfer RNAs (tRNAs).
Transfer RNAs decode the message and assemble the amino acids it specifies in the order listed. A polypeptide chain forms and is released into the cytoplasm, to travel elsewhere for further processing.
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