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Which of the following mediators is released during T-cell activation?

Refer to the following results for peripheral blood samples: % T lymphocytespatient #1: 85%patient #2: 23%patient #3: 51%patient #4: 82%normal control: 44%The data above indicates:

A peripheral blood total leukocyte count is 10.0 × 103/µL. The differential reveals 55% neutrophils, 2% eosinophils, 40% lymphocytes and 3% monocytes. Assuming a lymphocyte recovery of 85%-95%, what is the expected number of T cells in a normal individual? 

Cells from a patient with hairy cell leukemia have immunologic and functional feature of:

Refer to the following illustration: Which of the above figures demonstrates a reaction pattern of identity?

Refer to the following illustration: A nonspecific precipitin reaction is demonstrated is:

Which of the following complement components is a strong chemotactic factor as well as a strong anaphylatoxin?

Which of the following releases histamine and other mediators from basophils?

Which of the following is the “membrane attack complex” of complement activation?

Bone marrow transplant donors and their recipients must be matched for which antigen system(s)?