
Native gel electrophoresis for six introns. Pre, precursor; G-I, excised intron with GMP at its 5′ end; LE, ligated exons. The asterisk denotes the following modification of condition E: 0.4 M NH4Oac, 10 mM Mg(OAc)2. GMP was used in place of GTP in this particular series of experiments.










