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- Hey, do you know what are the different types of antibodies and the roles they play in the immune response?
- I'm afraid I don't understand what you're on about. Please explain.
- IgG is the most prevalent antibody isotype in plasma, accounting for 70-75 percent of all human immunoglobulins (antibodies).
- Human antibodies are categorized into five isotypes based on their H chains (IgM, IgD, IgG, IgA, and IgE), with each isotype having unique properties and roles. 
- Mhm.. okay...
- IgG is the primary antibody in blood, and it has a strong ability to attach to germs and poisons, making it a crucial component of the biological defense system.
- It is the only isotype that can cross the placenta, and IgG from the mother's body protects the infant.
- hmm. Interesting 
- IgM is made up of five basic Y-shaped components and is mostly found in the blood. IgM, which is produced by B cells in response to pathogen invasion, plays an important part in the body's early immune system defense.
- oh okay makes since.
- IgA is mostly found in blood as monomers (the shape of a single Y), but it forms dimers (a mixture of two Ys) in secretions such as intestinal fluid, nasal discharge, and saliva to inhibit bacterial invasion via a mucous membrane. 
- It is also found in breast milk and protects neonates' gastrointestinal tracts from bacterial and viral illness.
- IgD is found on the surface of B cells and has been linked to the stimulation of antibody production as well as the protection of respiratory tract infections.
- that's great 
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