In the lymphatic microenvironment, HS has been found to play important roles in the formation of chemokine gradients as well as the recruitment of inflammatory and immune cells into lymphatic vessels [36]. Whether and how the glycan HS produced by DCs might possibly play a role in mediating basic DC functions have remained a 0 102 103 104 105 0 50K 100K 150K 200K 250K 0 102 103 104 105 0 50K 100K 150K 200K 250K CD11chi cells WT Sdc4(-/-) 300 250 200 150 100 50 0 Day 0 Tumor Volume (mm )3 A B C 4 7 10 Days Post-Injection C57Bl/6 (WT) Sdc4-/- ** ** D Neoplasia Vol. 18, No. 5, 2016 Dendritic Cell Biology and Tumor Growth El Ghazal et al. 303 mystery. Findings herein support an important role for this glycan in mediating both chemokine-driven DC trafficking as well as maturation in vitro and in vivo, a unique phenotype that is preserved in both BMDCs and TIDCs.