Figure 1: Comparison between the young rabbit’s umbilicus observed by Chinese researchers (a) and Bonghan corpuscle (BHC) (b) in the longitudinal section. (a) A photo of hematoxylin and eosin (H&E) staining showing the longitudinal profile of the young rabbit’s umbilicus (magnification, ×4), being cord-shaped in outline and about 2 cm in length. (b) A photo of the longitudinal profile of BHC presented by Northern Korean National Acupuncture Meridian Research Institute in 1963.