Any process that modulates the frequency, rate or extent of complement activation.

An area of close contact between a lymphocyte (T-, B-, or natural killer cell) and a target cell formed through the clustering of particular signaling and adhesion molecules and their associated lipid rafts on both the lymphocyte and the target cell and facilitating activation of the lymphocyte, transfer of membrane from the target cell to the lymphocyte, and in some situations killing of the target cell through release of secretory granules and/or death-pathway ligand-receptor interaction.

The change in morphology and behavior of a dendritic cell resulting from exposure to a cytokine, chemokine, cellular ligand, pathogens, or soluble factor.

The change in morphology and behavior of a microglial cell resulting from exposure to a cytokine, chemokine, cellular ligand, pathogen, or soluble factor.

Catalysis of the reaction: H2O + peptidyl-L-lysine (or L-arginine) = L-lysine (or L-arginine) + peptide (preferential release of a C-terminal lysine or arginine amino acid).

A change in the morphology or behavior of a cell resulting from exposure to an activating factor such as a cellular or soluble ligand.

The process of regulating the proliferation and elimination of cells of the immune system such that the total number of cells of a particular cell type within a whole or part of an organism are stable over time in the absence of an outside stimulus.

The processes by which an organism enters and maintains a periodic, readily reversible state of reduced awareness and metabolic activity. Usually accompanied by physical relaxation, the onset of sleep in humans and other mammals is marked by a change in the electrical activity of the brain.

Feeding behavior in a fully developed and mature organism.

The breakdown into simpler components of unfolded or misfolded proteins transported from the endoplasmic reticulum and targeted to cytoplasmic proteasomes for degradation.

Any process preventing the degeneration of the photoreceptor, a specialized cell type that is sensitive to light.