... extent of splicing inhibition by tetracycline is n egligible (Fig. 2). The sixfold stron gersplicing inhibition by Cl-tetracycline may be explained by the a dditional s ize and hydrophobicity introduced ... glycoside, streptomycin, t hepenicillins, ampicillin and penicillin G, the aminocyclitol,spectinomycin, tetracycline and Cl-tetracycline, and the macrolide, erythromycin) on n uclear b-globin ... in inhibition of spliceosome assembly. Formation of the presplicing complexes A and B was slightly reduced by increasing concentrations of erythromycin (lanes 5±7).Interestingly, formation of...