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So if you release the rachni queen (SPOILERS)
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Cerberus had their own rachni queen from ME1, hence why it was intelligent drones that took over the supply depot. Agent Rawlings's data from N7: Lost Operative also supports them hanging on to that queen into ME2.
"Today, science fiction - tomorrow, science fact." ~ Isaac Asimov "What's the point of living if you don't believe in anything?" ~ Me