Figure 3From: Primordial soup or vinaigrette: did the RNA world evolve at acidic pH?A self-cleaving ribozyme isolated by in vitro -selection has maximal activity at pH 4.2. The rate of cleavage obtained at each pH value was normalized to the maximum rate measured at pH 4.2. Figure adapted with permission from [11] Jayasena and Gold 1997 ©1997 National Academy of Sciences, U.S.A.Back to article page