5′

5 5̂ 5. English Noun - That end of any DNA strand that has a terminal phosphate group. Antonyms en 3′ Adjective en informal Relatively close to the 5′ end of a strand of DNA. 1992, James D. Watson et al., Recombinant DNA, second edition, Scientific American Books, 0716722828, page 147: A CG pair is often designated CpG to signify that the two nucleotides are contiguous in DNA and that the C is 5′ to the G.