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AFP is found in all of the following fetal structures except the:
Costimulation
A process in immunology where an additional signal provided by one immune cell enhances the activation or survival of another, leading to an effective immune response.
Immune Response
The immune response is the body's defensive reaction to substances or organisms that are identified as foreign or harmful.
B Cell
Type of lymphocyte responsible for antibody-mediated immunity.
T Cell
Thymus-derived lymphocyte of immunologic importance; it is of long life and is responsible for cell-mediated immunity.
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Q21: Which one of the following abnormalities is