Schematic representation of the PSA-HSP plasmid vectors used for immunizations. The chimeric PSA-HSP protein junction sequences are shown in letters. The plasmid vectors are numbered for convenient referencing: 1 pVax, 2 pVax-PSA, 3 pVax-PSA-hsp65Myc, 4 pVax-PSA-hsp70Hum, 5 pVax-PSA-hsp70Myc, and 6 pVax-PSA-DnaK