curprev02:1702:17, 18 June 2020 SUM1talkcontribs 3,563 bytes−19 Changing short description from "A DNA mutation that exchanges a purine nucleotide (A or G) by a pyrimidine nucleotide (C or T), and vice-versa" to "DNA point mutation that exchanges a purine (A or G) for a pyrimidine (C or T) or vice versa" (Shortdesc helper)undo