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. And that's exactly why that ribosomal RNA can attach itself onto the Shindal Garno sequence. And once it attaches itself, it essentially forms that entire complex, the ribosome complex. And it stimulates a tRNA molecule, a transfer RNA molecule to bring an activated amino acid we call formal methionine or FMet.