Midi-chlorian

Midi-chlorians were microscopic, intelligent life forms that originated from the foundation of life in the center of the galaxy in Star Wars, and ultimately resided within the cells of all living organisms, thereby forming a symbiotic relationship with their hosts. The Force spoke through the midi-chlorians, allowing certain beings to use the Force if they were sensitive enough to its powers. In order to gauge an individual's potential in the Force, blood tests were used to estimate the number of midi-chlorians within the subject's cells. Anakin Skywalker possessed the highest known count in galactic history—over twenty-thousand midi-chlorians—surpassing the potential of Grand Master Yoda and all Jedi.