What has to happen is we have to have this specific sequence of nucleotides that is rich in puree nucleotides known as the Shine Delgarno sequence that has to be found about ten nucleotides upstream to the left of the first Aug sequence. So as shown on the following diagram. So let's imagine this is the mRNA molecule inside that particular bacterial cell. So we have this Aug sequence, Aristocodon, and about ten nucleotides upstream to the left we have this sequence rich in pure nucleotides known as the Shine Dalgarno sequence. And what happens is a specific rRNA molecule, ribosomal RNA. The 16s ribosomal RNA of that ribosome has a complementary nucleotide sequence that is complementary to the Shine Dolgarno sequence.