the polar effects of tn5 insertions on the expression of the l11 , l1 , l10 , and l12 ribosomal protein genes and the beta rna polymerase subunit gene were examined ( i ) by the level of beta-galactosidase activity generated from l10-lacz and beta-lacz gene fusions , ( ii ) by direct sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the proteins specified by plasmid ribosomal protein genes in uv-irradiated maxicells , and ( iii ) by urea-polyacrylamide gel electrophoresis of plasmid- and chromosome-specified l12 protein .
C0035552
ribosomal protein
C0033684
protein