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| 91. | psychoneuroimmunology | study of the connections between the immune, nervous, and endocrine systems |
| 92. | regulatory T cells | (Treg) (also, suppressor T cells) class of CD4 T cells that regulates other T cell responses |
| 93. | right lymphatic duct | drains lymph fluid from the upper right side of body into the right subclavian vein |
| 94. | secondary adaptive response | immune response observed upon re-exposure to a pathogen, which is stronger and faster than a primary response |
| 95. | secondary lymphoid organs | sites where lymphocytes mount adaptive immune responses; examples include lymph nodes and spleen |
| 96. | sensitization | first exposure to an antigen |
| 97. | seroconversion | clearance of pathogen in the serum and the simultaneous rise of serum antibody |
| 98. | severe combined immunodeficiency disease | (SCID) genetic mutation that affects both T cell and B cell arms of the immune response |
| 99. | spleen | secondary lymphoid organ that filters pathogens from the blood (white pulp) and removes degenerating or damaged blood cells (red pulp) |
| 100. | T cell tolerance | process during T cell differentiation where most T cells that recognize antigens from one's own body are destroyed |
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