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the ribosome binding site interacts with which specific molecule in the ribosome
The Ribosome Binding Site base-pairs with an RNA molecule that forms part of the bacterial ribosome.
what molecule does the ribosome binding site interact with in eukaryotes
Mostly, ribosome binding sites refer to bacterial sequences, although internal ribosome entry sites have been described in mRNAs of eukaryotic cells or viruses that infect eukaryotes.

Question: what does the eukaryote equivalent do
Self-contained rewrite: what do internal ribosome entry sites do