How To Write Mrna Sequence Example . Simultaneous, adaptor ligation and library preparation are practised before doing sequencing. You now see, on the left, a text describing annotation of the specific mrna, starting with a menu and mouse over submenu. Genes from sphweb.bumc.bu.edu Strands and directions of synthesis. Protein chains are synthesized from the amino ends > > > to the carboxy ends. One start codon, aug, marks the beginning of a protein and also encodes the amino acid methionine.