@tokensane @johncarlosbaez
Yes, though of course nobody would propose using directly the reaction from the sun for fusion power!
That's the Carbon/Nitrogen/Oxygen (CNO) cycle (and numerous variants; turns out the sun's complicated!).
On the one hand, good news: the CNO cycle can happen at much lower temperatures than a tokamak's DD or DT fusion (let alone some wonderful aneutronic beast like protons on boron).
On the other hand, bad news: it's a ring of 6 separate reactions, 2 of which are WEAK interactions tossing off neutrinos.
So that's slow. (There are, I seem to recall, about 5 different variations on this theme at various temperatures and pressures. But always 6 reactions, always 2 of them weak.)
Here's a picture from WIkipedia of one of them (CNO-I).
https://en.wikipedia.org/wiki/CNO_cycle
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