immunity - complex biological system that can recognize and tolerate whatever belongs to the self, and to recognize and reject

adaptive antibody antigens background bacteria capsules cells combine concept conceptual cultures definition design gastrointestinal health healthy immune immunity immunogen immunology induce life live medical medicine micro biota biotics microorganisms molecular molecules nutrition probiotics products property proteins quote representation response surface system tcells text transfused transplanted word hand marker complex biological recognize tolerate belongs self reject foreign