Helps activate T cells, which are produced in bone marrow but mature in the thymus gland
HELLPP

Blood made up of red and white blood cells work together to form

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.