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In page National Academy of Sciences:

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Over the entire history of the NAS, Harvard University is associated with the most members (331) overall, while the University of California at Berkeley is associated with the most members (255) without including the medical school. E.g. of the topmost schools, UC Berkeley/MIT/Princeton/Caltech do not have medical schools, while Harvard/Stanford do. The top ten institutions, two of which are from the University of California System and another four of which are in the Ivy League, account for nearly 28% of all members ever elected. Those ten are also precisely the only institutions in the entire history of the NAS to have had 100 or more members overall.[citation needed]