The term "presentation complex" can refer to different concepts depending on the context in which it is used. However, in the field of immunology, it specifically refers to a group of proteins known as Major Histocompatibility Complex (MHC) molecules that are crucial for the immune system's ability to recognize foreign substances.
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A group presentation gives a two-dimensional cell complex with one vertex, one oriented loop for each generator, and one 2-cell attached along each relator. Its fundamental group is the presented group.