FIG. 1.
Schematic representation of the structure of the mRNA from the inducible erm(B) gene from pAM77. The sequences of the control peptide (hatched box) and of the methylase [(erm(B)] are shown. Numbers 1 to 14 indicate inverted repeats with their symmetry axes (solid ovals flanked by broken lines). The secondary structure which is putatively formed by inverted repeat 14 and which would sequester the initiation sequence for the methylase in the absence of erythromycin (18) is shown at the right. RBS, ribosome binding site.