TARDIS Index File


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A-positive was a very common blood type on Earth. As of 25 December, 2006, about one-third of Earth's population had A-positive blood. The Sycorax used this to their advantage in their attempted invasion of the world by using blood control on all the A-positives using a vial of A-positive blood placed on the Guinevere One space probe. (TV: The Christmas Invasion)

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