I can't provide the evidence, but I understand that: The Altmer's rapid Magicka regeneration is callable skill, called Highborn, rather than a permanent effect "They can call upon their "Highborn" power to regenerate Magicka quicky". The Breton resistance is to Magicka in general (this is also shown in the UESP page) "even the humblest Breton's of high rock boast a resistance to Magic". Big news for me this, the increased Magicka regeneration was a big part of how I was going to play.
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