Do acupuncture points exist? N149 Position(mm) Ca. Cu. Fe. Zn position along the meridian, where the two Table 1. The reduction ratio(Center -M)/Center)x 100% of Ca, Fe, Cu and Zn at a point of 2 mm away from the center of Xiajuxu and Tiaokou along the meridian and 1. 4 mm away from the center of the two acupuncture points in the direction perpendicular to the meridian. Acupuncture points Positions of Perpendicular to Perpendicular meridian(%) the meridian(%) meridian(%) the meridian (%) 47.7士1.8 40.8±4.8 71.3±3.7 374±3.7 39.2±3.4 20.8±112 86.7±8.2 34.9±9 35.9±95 35.5±14 40.9±14 38.0±1.5 43.0±14 4. Conclusions Using synchrotron x-ray fluorescence, we determined that the contents of Ca, Fe, Cu and Zn were significantly higher at three out of four acupuncture points examined than in the rrounding tissue, with closely similar ratios of Cu to Fe at points Jianshi, Tiaokou andDo acupuncture points exist? N149 Figure 7. Contents of Ca, Cu, Fe, Zn versus the position along the meridian, where the two acupoints Jianshi and Ximen are located on sample 1. Table 1. The reduction ratio ((Ncenter − N)/Ncenter) × 100% of Ca, Fe, Cu and Zn at a point of 2 mm away from the center of Xiajuxu and Tiaokou along the meridian and 1.4 mm away from the center of the two acupuncture points in the direction perpendicular to the meridian. Xiajuxu Tiaokou Acupuncture points Positions of In the Perpendicular to In the Perpendicular to measurement meridian (%) the meridian (%) meridian (%) the meridian (%) Ca 41.7 ± 2.6 79.3 ± 2.1 47.7 ± 1.8 56.6 ± 1.7 Fe 40.8 ± 4.8 71.3 ± 3.7 37.4 ± 3.7 39.2 ± 3.4 Cu 20.8 ± 11.2 86.7 ± 8.2 34.9 ± 9.5 35.9 ± 9.5 Zn 35.5 ± 1.4 40.9 ± 1.4 38.0 ± 1.5 43.0 ± 1.4 4. Conclusions Using synchrotron x-ray fluorescence, we determined that the contents of Ca, Fe, Cu and Zn were significantly higher at three out of four acupuncture points examined than in the surrounding tissue, with closely similar ratios of Cu to Fe at points Jianshi, Tiaokou and