Reading frame15′- HUU CU GGA CC U GG A GA U UC A CIA GU-8 Reading frame2--UU C UC G GA C CUG GAGAUU CA C AGU Reading frame3--UUCUCGGACCUGGAGA A GU Each mRNA molecule would have three potential reading frames(but only one usually codes for a polypeptide chain)Each mRNA molecule would have three potential reading frames (but only one usually codes for a polypeptide chain)