Figure 1.

Schematic illustration of lymphatic vessels and lymph node. (A) Initial lymphatic vessels paralleled with blood capillary stretched into the interstitium. Initial lymphatic vessels with blind-ended structures and discontinuous basement membrane, while the blood capillary with tight junction of endothelial cells. (B) The structure of lymph node which can be divided into cortex, paracortex and medulla zone. Reproduced with the permission from Ref. 57. Copyright © 2015 Springer Nature.