Schematic representation of plasmids of wild-type BaMV-S as well as recombinant pBS-d35CP and pBVP1. (a) pBaMV-S is an infectious BaMV cDNA plasmid under the control of cauliflower mosaic virus 35S promoter. The BaMV genome comprises 5 open reading frames (ORFs). The ORF1 encodes for viral replicase, whereas ORF2, ORF3 and ORF4 are called a "Triple-gene-block" that encodes viral movement proteins. ORF5 (CP) encodes a structural protein for virion formation. (b) pBS-d35CP is a mutated BaMV plasmid whose DNA coding for the N-terminal 35 amino acids of CP has been truncated, and multiple cloning sites have been engineered. (c) pBVP1 is a recombinant plasmid derived from pBS-d35CP by inserting the DNA coding for the 37 amino acid VP1 peptide to replace that coding for the N-terminal 35 amino acids of CP.