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Antigens.
a lymphocyte
By presenting small pieces of the organism on their surface
Sometimes chlamydia surface antigens change, and make it hard for the immune system to keep up. It also appears that chlamydia may release toxins that damage the immune response in some cases. (see related link).
Ann antibody is a complex protein molecule. Our immune system uses antibodies to fight bacteria.
Class I and II MHC molecules are what the body uses to recognize it's own cells as "self". If it detects an antigen (anything foreign to the body) the immune system will trigger a response.
receptors
Immune system starts rejecting the organ of the recipient because the Human Leukocyte Antigen (HLA) which is present on the surface of the transplanted organ of the donor does not match with the recipient.
coded messages in the DNA
your immune system and your White blood cells produce antibodies
Acquired Immune System or Adaptive immune System
In one approach, genes that produce specific HIV proteins have been altered to stimulate immune system functioning without causing the negative effects that a complete HIV molecule has on the immune system