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Many scientific observations have supported the existence of acupuncture points and channels as they have been perceived by doctors, patients, scholars, and others in Oriental medicine. These include low electrical activity at acupoints, radio-isotope tracing, thermal and sense propagation, and galvanic currents.

Now, scientists have injected magnetic nanoparticles into living flesh and traced their movement along natural pathways using magnetic fields. The natural pathways travelled by the nanoparticles do not correspond to any physical anatomical structure visible to the naked eye; they do, however, correspond to acupuncture channels as described by acupuncture medicine.

Reference: Evid Based Complement Alternat Med. 2007 March; 4(1): 77–82