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California University system

Use a comma in the names of UC institutions:
            University of California, Berkeley
            University of California, Davis

Generally omit a second comma after the campus designation unless the sentence structure requires it or it helps with readability:
            He enrolled in the University of California, Berkeley last year.
            Having graduated from the University of California, Davis, he went on to establish his first vineyard.

Schools may be abbreviated:
            UC Berkeley
            UC Davis