The patent expiry of Merckâs Singulair in 2012 and Advairsâ in 2016 will shift the manufacturers to generic drugs. The purchasers will have high bargaining power due to large competition in the market and cost consciousness is expected to remain one of the major constraints in the COPD and asthma drug market.
Lymphocytes are different from other types of white blood cells because they recognize and remember invading bacteria and viruses. T lymphocytes, or T cells, are responsible for cell-mediated immunity. T cells come in many types with specific functions, including: 1  Helper T cells direct the immune system. 2  Cytotoxic T cells release certain chemicals that break open to kill invading organisms. 3  Memory T cells remain after this process to help the immune system respond more quickly when the same organism is encountered again. 4  Suppressor T cells do ...
The function of the thymus is to receive immature T cells that are produced in the red bone marrow and train them into functional, mature T cells that attack only foreign cells. T cells first reside within the cortex of the thymus where they come in contact with epithelial cells presenting various antigens.