22.3 Nuclear splicing proceeds through a OH lariat EX-P最AOP正XCn2 Figure 22.7 Nuclear splicing occurs by two Exon- OH transesterification SUC reactions in which 知 Aus. OP-Ekon a free OH end attacks a phosphodiester pl Exn①Pxn2 bond 消当 CIREILAIIEEr-OHFigure 22.7 Nuclear splicing occurs by two transesterification reactions in which a free OH end attacks a phosphodiester bond. 22.3 Nuclear splicing proceeds through a lariat