Fig. 1.

Plasmids for expression of rPA peptide fusions. Map of constitutive rPA/DC-peptide fusions and control plasmid, pTRK895 (A) and schematic of the expression cassettes for DCpep and Ctrlpep, pTRK896 and pTRK895 (B), respectively. Replication determinants are shown as black arrows; transcriptional terminators are shown as black boxes; the erythromycin resistance gene is shown in dark gray; pag is shown in light gray; DC or Ctrl (control) peptide coding sequences are represented by the gray arrow (pag); promoters are shown in white.