Reactions Triggered in Response to the Presence of a Foreign Body or the Occurrence of an Injury Which Result in Restriction of Damage to the Organism Attacked or Prevention/recovery From the Infection Caused by the Attack.
Any Process in an Organism That Results in the Killing of Cells of Another Organism Including in Some Cases the Death of the Other Organism. Killing Here Refers to the Induction of Death in One Cell by Another Cell Not Cell Autonomous Death Due to Internal or Other Environmental Conditions.
The Space External to the Outermost Structure of a Cell. For Cells Without External Protective or External Encapsulating Structures This Refers to Space Outside of the Plasma Membrane. This Term Covers the Host Cell Environment Outside an Intracellular Parasite.