Examlex
The nonessential amino acids cannot be produced from the other amino acids or from simple organic molecules.
CD4
A glycoprotein found on the surface of immune cells like T helper cells, playing a key role in the immune system by aiding in the response to antigens.
Antibody Units
Individual molecules of antibodies, which are proteins produced by the immune system to identify and neutralize pathogens like bacteria and viruses.
Initial Injection
The first dose or administration of a substance or drug into a body or system.
Secondary Response
The immune system's more rapid and intense response to a pathogen when it is encountered for the second time, due to the presence of memory cells.
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