Methionine accepting tRNAs in E. coli

Vontains two types of tRNAmet. tRNAfmet and tRNAmmet. tRNAfmet : Met residues attached to this are formylated, Initiate polypeptide chains only, Recognises AUG and GUG. tRNAmmet : Met residues are only attached, not formylated, Recognises the codon AUG only, Used as a source of internal met residues