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T-negative was a rare Vulcan blood type.

Both Ambassador Sarek and his son Commander Spock shared this type. For this reason, in 2268, when Sarek underwent emergency heart surgery aboard the USS Enterprise, Spock served as his blood donor. (TOS: "Journey to Babel")

T-Negative was also the name of a fanzine published in the 1960s and 70s.

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