Cytotoxic T cells
A. secrete granzymes and perforins that damage target cells.
B. lack specificity for antigen.
C. secrete interleukin-2 to stimulate B and T cells.
D. are activated by free, soluble antigens.
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Based on new information from the Human Microbiome Project, the human body typically begins to be colonized by its normal biota
A. during and immediately after birth.
B. before birth, in utero.
C. during puberty.
D. when an infant gets its first infectious disease.
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