immune system development
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.
GO:0002376
immune system process
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GO:0048731
system development
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GO:0160108
animal gross anatomical part developmental process
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