Midi-chlorians
From Multiversal Omnipedia
Midi-chlorians are microscopic organisms that live a symbiotic life within a person's bloodstream. Said to channel the Force, a high count of midi-chlorians in a person's blood indicates a great potential as a Force-user.
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Comments
The addition of midi-chlorians into Star Wars canon with The Phantom Menace sparked some controversy among fans, who believed it took away from the mystical nature of the Force.
