T-cell precursors proliferate extensively in the thymus, but most die there.
Approximately 98% of the thymocytes that develop in the thymus die from apoptosis.
There are two mechanisms that remove T lymphocytes: tolerance and the ability to recognize
General principles of signal transduction and propagation
Cell-surface receptors convey information received from the extracellular environment across
the plasma membrane to generate intracellular biochemical events, which are transmitted
The generation of T-cell receptor ligands
Two major compartments: vesicular and cytosolic
The MHC class I and class II molecules deliver peptides to the cell surface from two intracellular
Soft with low melting point and boiling point
Low density (Li, Na, and K less dense than water)
They can reduce oxygen, chlorine, ammonia and hydrogen.
The reaction with oxygen tarnishes the metals in air, so they are stored under
The induced responses of innate immunity
Phagocytes immediately recognize the presence of a pathogen
Monocytes and macrophages (including mononuclrar phagocytes and neural tissue
microglial cells, and Kupffer cells in the liver) present in large number i