Question

what prevents your immune system from attacking your own cells?
receptor proteins
cholesterol
fever
inadequate enzymes
recognition proteins

Explanation:

• Receptor proteins: These are involved in signal - transduction pathways and not directly in preventing the immune system from attacking self - cells.
• Cholesterol: It is mainly involved in membrane structure and lipid transport, not in immune self - recognition.
• Fever: It is a part of the body's response to infection (raising body temperature to combat pathogens), not related to preventing immune attack on self - cells.
• Inadequate enzymes: Enzymes are involved in biochemical reactions in general, not specifically in immune self - recognition.
• Recognition proteins (such as major histocompatibility complex - MHC proteins in humans): These proteins are present on the surface of cells. The immune system learns to recognize “self” through these proteins during development. Immune cells (like T - cells) are trained to not attack cells with the “self” recognition proteins.

Answer:

Recognition proteins