The process whose specific outcome is the progression of an organismal system whose objective is to provide calibrated responses by an organism to a potential internal or invasive threat, over time, from its formation to the mature structure. A system is a regularly interacting or interdependent group of organs or tissues that work together to carry out a given biological process.

biological_process

GO:0002520

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/go.owl, http://purl.obolibrary.org/obo/cl.owl

• somatic diversification of immune receptors
• tolerance induction
• hematopoietic or lymphoid organ development