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Vasa vasorum in close proximity to the lumen of NTSVG. Note red CD31-endothelial immunostaining concentrated close to the NTSVG lumenal folds as seen in a circumferential section of the vein; Lu = lumen. (Modified from Dashwood et al., Angiology 2004, 55(4):385–395 with acknowledgement of SAGE Publishing, Westminster Publications, Inc., USA)
