Skin wounds in humans heal nearly three times slower than in other primates

Maybe less activation of cytokines?

I thought it was a fairly well known thing that rough wounds heal faster than very neatly sliced wounds, though now that I think about it I don't know where I picked that up.

We collectively kill billions of animals per year for food with little regard for their welfare, and much of that food is then wasted. There is probably more gained through such studies relatively speaking.

Does that mean we should do them? I don't know, but that decision should be related to how we treat other animals more generally. I always found it strange that the "no animals were harmed in the making of this film" disclosure seemingly exempts the catering tent.

While I agree with the sentiment, science seems to be one of the least bad reasons for stabbing monkeys.