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macrophage activation (GO:0042116)
A change in morphology and behavior of a macrophage resulting from exposure to a cytokine, chemokine, cellular ligand, or soluble factor.
Specific
macrophage activation involved in immune response (GO:0002281)
microglial cell activation (GO:0001774)
General
myeloid leukocyte activation (GO:0002274)
References
gene ontology: GO:0042116
PMID: 14506301