CD4 and CD 8 are molecules present on the surface of T cells where they interact with major histocompatibility (MHC) Molecules.
CD4 and CD8 improve T cell signalling by attaching to MHC class II (CD4) or MHC class I (CD8) molecules on APCs.
- The association of CD4 with MHC class II significantly decreases the number of antigenic peptides necessary for T cell activation (5) and significantly boosts cytokine output by helper T cells.
The MHC molecules' wide polymorphism is their distinguishing trait.
- This polymorphism is crucial for T cell antigen recognition.
- A T cell detects antigen as a peptide bound by a specific allelic variation of an MHC molecule and will not identify the identical peptide bound by other MHC molecules.
- This type of T cell activity is known as MHC limitation.
Hence, the correct answer is option C
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# SPJ4
<span>Benzodiazepines , which are included in a class of drugs called hypnotics; some types of benzodiazepines include clonazepam (Klonopin), diazepam (Valium), temazepam (Restoril), estazolam, alprazolam (Xanax), and lorazepam (Ativan). These drugs may be used to treat parasomnias. Occasionally, they are also used to treat bruxism (teeth grinding) and short-term insomnia.</span>
Answer:
the process of breathing (inhalation)
