“…By solid‐phase chemical synthesis, ligation, aptamer‐ or enzyme‐based labeling, RNA can be labeled with radioactive or fluorescent groups, biotins and enzymes [7–10] . For instance, a 32 P radiolabel, with the advantages of increased sensitivity and easy disposal, has been widely used in synthesized RNAs for experimental analyses [8] . However, in vivo labeling techniques for RNA lag behind in vitro methods.…”