Final answer:
Pyrogens are not produced by cytotoxic T cells; they are released by other immune cells such as macrophages. Cytotoxic T cells release granzymes, perforins, and granulysin to induce apoptosis in infected cells.
Step-by-step explanation:
The chemical that is not produced by cytotoxic T cells is A. pyrogens. Cytotoxic T cells, also known as Tc cells or CD8+ cells, play a crucial role in the immune system by targeting and eliminating cells infected by pathogens. Upon recognizing an infected cell, cytotoxic T cells release several key proteins to induce cell death. These proteins include granzymes, perforins, and granulysin.
Granzymes are serine proteases that enter the infected cell through the pores created by perforins, leading to apoptosis or cell death. Granulysin also contributes to the destruction of the target cell by disrupting its membrane. However, pyrogens, which are substances that cause fever, are not among the chemicals released by cytotoxic T cells. Instead, they are typically produced by other immune cells, such as macrophages, in response to infection.