Lymph Drainage - Tissue Functioning and Remodeling in the Circulatory and Ventilatory Systems - page 186

In addition, fibroblastic reticular cells enhance the survival of naive T lymphocytes
by releasing interleukin-7, presenting antigen to T lymphocytes, and supporting
differentiation of regulatory dendritic cells.

4.3 Lymph

The lymph has a composition close to that of the plasma. The lymph-to-plasma
protein concentration ratio is equal to about 0.75. The compositions in lipid (free
cholesterol, cholesterol ester, triacylglycerol, and phospholipid) of plasma and
lymph lipoproteins are similar or differ according to lipoprotein types.
The protein-rich lymph contains cells such as extravasated leukocytes and
activated antigen-presenting cells. In the small intestine, lymphatic vessels of the
intestinal villi absorb the dietary fat released by enterocytes that form chylomicrons.