I nclude the bone marrow, lymph nodes, spleen, and thymus. Precursor cells in the bone marrow produce lymphocytes. B-lymphocytes (B-cells) mature in the bone marrow. T-lymphocytes (T-cells) mature in the thymus gland. Besides providing a home for lymphocytes (B-cells and T-cells), the ducts of the lymphatic system provide transportation for proteins, fats, and other substances in a medium called lymph.
A book that is made with a stiff paper cover and bound directly to the text block. Many paperback books are converted to hardcover books by mylar binding. Perfect bind
In USA, block mean city block, 'hood, smallest area surrounded by streets. 2. In Central/Eastern Europe, Poland, post-DRG Germany & France, block is fuckin' HUGE apartment bulding made of concrete panels, where people live like rats in cages. Worst muthafuckin ghetto you can imagine.