Where is the respirator implant?

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I've completed a fair number of missions, and I'm reaching a point where most of the remaining quests require the respirator implant to get through a gassed out area. Unfortunately, I haven't been able to find anyone selling it and I'm down to one remaining non-gas mask mission, the good cop quest.
Where does one receive or buy the respirator implant, in order to walk through poison gas without damage?
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