the spin-lattice relaxation measurements at 30 and 35 degrees c of two decamers , d ( cgpuaatttcg ) and d ( cgaaatttcg ) , reveal that the elimination of two single hydrogen bonds of da.dt base pairs ( due to the substitution of adenine for purine ) in the sequence results in an increase in the overall imino proton exchange rate from 7 to 36 s-1 at the site of mismatch .
C0001407
adenine
C0034140
purine