Nicotiana/metabolism; Nitrogen/metabolism; Plant Leaves/metabolism; Ribulose-Bisphosphate Carboxylase/metabolism; Algorithms; Amino Acid Sequence; Animals; Bayes Theorem; Chromatography, Liquid/standards; Herbivory; Likelihood Functions; Lipoxygenase/chemistry; Lipoxygenase/isolation & purification; Lipoxygenase/metabolism; Molecular Sequence Data; Nitrogen Isotopes/metabolism; Peptide Fragments/chemistry; Peptide Mapping/standards; Phosphorylase b/chemistry; Plant Extracts/chemistry; Plant Extracts/isolation & purification; Plant Leaves/chemistry; Plant Proteins/chemistry; Plant Proteins/isolation & purification; Plant Proteins/metabolism; Rabbits; Reference Standards; Ribulose-Bisphosphate Carboxylase/chemistry; Ribulose-Bisphosphate Carboxylase/isolation & purification; Spectrometry, Mass, Electrospray Ionization/standards; Tandem Mass Spectrometry/standards; Nicotiana/chemistry