It has been two decades since the enzymic incorporation of functionalized nucleotides was first suggested to be useful to tag DNA with functionality that it did not intrinsically carry.[1]1. Langer , PR , Waldrop , AA and Ward , DC 1981. Enzymic synthesis of biotin-labeled polynucleotides: Novel nucleic acid affinity probes. Proc. Natl. Acad. Sci. USA-Biol. Sci., 78: 6633–6637. [CrossRef], [PubMed], [Web of Science ®] View all references [2]2. Bergstrom ...