Bacteria 4 Core oligosaccharide 4 Lipid A 4 Lipopolysaccharides 4 Mass spectrometry 4 bacterium lipopolysaccharide 4 lipid A 4 matrix assisted laser desorption ionization time of flight mass spectrometry 4 nonhuman 4 phosphoethanolamine ABC transporter 2 ATP-Binding Cassette Transporters 2 Acylation 2 Antigens 2 Article 2 Bacterial Proteins 2 Brucella 2 Brucella abortus 2 Brucella suis 2 Carbohydrate Sequence 2 Cell membranes 2 Citrus 2 Citrus canker 2 Citrus fruits 2 Citrus leaves 2 Citrus sinensis 2 Core region 2 Defense related genes 2 Desorption 2 Economical damage 2