Adjuvants, Immunologic/pharmacology; Dendritic Cells/immunology; Lymphocytes/immunology; Nicotiana/metabolism; Oncogene Proteins, Viral/immunology; Papillomavirus Vaccines/immunology; Plant Extracts/immunology; Plants, Genetically Modified; Adjuvants, Immunologic/isolation & purification; Antigen Presentation; Cell Differentiation; Cell Line, Tumor; Cell Survival; Coculture Techniques; Cytotoxicity, Immunologic; Dendritic Cells/drug effects; Dendritic Cells/metabolism; Dose-Response Relationship, Drug; Genetic Vectors; Humans; Lymphocyte Activation; Lymphocytes/drug effects; Male; Oncogene Proteins, Viral/biosynthesis; Oncogene Proteins, Viral/genetics; Oncogene Proteins, Viral/isolation & purification; Ovalbumin/immunology; Ovalbumin/metabolism; Papillomavirus E7 Proteins; Papillomavirus Vaccines/biosynthesis; Papillomavirus Vaccines/genetics; Papillomavirus Vaccines/isolation & purification; Plant Extracts/isolation & purification; Plant Leaves; Potexvirus/genetics; Recombinant Proteins/immunology; Time Factors; Nicotiana/genetics