Lung Channel
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Which point is the Yuan-Source point on the Lung channel, meaning it can tonify Lung qi and Lung yin?
On yin channels, the Yuan-Source point is the third point in; on yang channels, it is the fourth point. Yuan-Source points on yin channels tonify; Yuan-Source points on yang channels clear excess.
Source: "The Lung Channel of Hand Taiyin." A Manual of Acupuncture, by Peter Deadman et al., Journal of Chinese Medicine Publications, 2007, p. 87 [Q127]