Chapter12核酸通论自 NH2 NH2 NH2 rder membrane CH -CH R CH3 R R NH2 CH3 HN CH3 H,N H2N RChapter12 核酸通论 HN N + H2N O CH3 N N R N N R N + N NH2 CH3 N N + NH2 CH3 N N R N N NH2 N + N R CH3 N + N R CH3 HN H2N N O N + N NH2 O R CH3