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Blood is the fluid that transports oxygen and nutrients around the body.


Blood contains a number of components such as red blood cells, plasma and white blood cells. (SG1: "Legacy", "Frozen") Certain chemicals such as histamine can be found in blood. (SG1: "The Broca Divide") A protein marker is left in the blood of former hosts when their symbiote dies. (SG1: "Legacy") If the blood of a symbiote mixes with the blood of a Jaffa, they will die very painfully. (SG1: "Crossroads") Humans and Ancients have red blood, Unas have bright green blood and symbiotes have a dark blue blood. (SG1: "The First Ones", "Frozen") Serrakins have a dark red blood. (SG1: "Forsaken")


The Untouched considered blood to contain their life force and were offended when asked for a sample by Teal'c; he retrieved one by force for Dr. Janet Fraiser to study. (SG1: "The Broca Divide") The Argosians had nanites in their blood and when the nanites infected Jack O'Neill he ended up with hundreds of times more in his blood. (SG1: "Brief Candle") Cassandra had Naquadah in her blood and further examination found that she had a potassium deficiency in her blood. (SG1: "Singularity") A blood sample from Teal'c after he had been stung by an alien insect quickly transformed from having Teal'c's DNA to having the insects DNA. (SG1: "Bane") Ma'chello's Goa'uld-killing organisms were programmed to leave a body if they detected the protein marker in the blood, indicating that they had killed the symbiote within. (SG1: "Legacy")

When a note came through the Stargate warning SG-1 not to go to P4C-970 it had blood on it and Dr. Fraiser had it analyzed. (SG1: "2010") Dr. Fraiser took some blood from the Harcesis Shifu who asked if it would be returned to him, but Fraiser told him it would be good after she ran some tests on it. (SG1: "Absolute Power")