Examlex
Which of the following classes of MHC antigens is necessary for antigen recognition by CD4+ T lymphocytes?
Theories
Systematically organized knowledge applicable in a wide variety of circumstances, especially to explain the nature or behavior of a specific set of phenomena.
Discovered
The process of uncovering or finding something unknown or unrecognized.
Nature
The collective manifestations of the physical realm, encompassing flora, fauna, terrains, and various natural formations and outputs of the planet, in contrast to entities or constructs made by humans.
Theory
A system of ideas intended to explain something, based on general principles independent of the thing to be explained.
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