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Blood is a liquid within the body of living creatures that provides oxygen and other nutrients throughout the body.
The Goa'uld release naquadah into the bloodstream of their hosts. Symbiote blood is fatal to hosts, and mixing their blood with their host will lead to the death of the host. The Goa'uld also release a toxin into the bloodstream of the host when they die. (SG1: "Children of the Gods", "The Enemy Within", "Singularity", "Crossroads", "Summit", "Last Stand")
- Goa'uld: Blue
- Human: Red
- Stragoth: Purple
- Unas: Green
- Wraith: Black
- Ancient: Red
- Alien creature: Blue
- Blood on Wikipedia