What modifications would be needed to allow humans to survive in space with limited protective gear?

Would it be possible to modify a human to be able to survive in space without protective gear?

Genetic engineering and cybernetic enhancement are both allowed, although when not in space the person in question should look completely normal.

I'd be interested both in modifications that allow emergency survival (for example functioning for 5 minutes in order to allow you to reach shelter after a hull breach) through to actually being able to live and work in space for extended periods of time wearing only minimal protective clothing.

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What modifications would be needed to allow humans to survive in space with limited protective gear?

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