With the exception of the N-terminal alanine, which comes from the 3' end of tmRNA itself, this tag sequence was traced to a short open reading frame in E. coli tmRNA.
Coa excepción da alanina N-terminal, que procede do extremo 3' do propio ARNtm, esta secuencia etiqueta foi rastreada ata un curto marco de lectura aberto no ARNtm de E. coli.