Do I have to get all of the possible Zerg and Protoss research in every mission of the Wings of Liberty campaign in order to get the top-level upgrades? I've missed a couple points and I'm wondering if I should go back and redo those missions to max out my research.


No, you do not. About 2/3ds of the way through (and especially after the Zeratul missions which give you a great deal of research poitns) you cap out on both, and you start being able to "sell" extra research to the Moebius Foundation for 10k each.

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