Essay 25 - Antigen - 25 If an antigen is defined...

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25) If an antigen is defined as "non-self," what cellular processes permit cells of the immune system to determine what is an antigen and what is not? T cells created randomly could recognize “self” too and create immune response against own cells but, killed off during development, so it only recognizes “non-self” Antigen, a molecule that is defined by the organism as “non-self” or foreign B-cells, antigen presenting cell: B cell receptors recognize epitopes (specific pieces of an antigen protein). They are complex proteins on the surface of the B cell that have the appropriate shape to fit specific antigens--form fits function). It takes the antigen into the cell, cuts it up into small pieces about the size of 5 or 6 amino acids in length and then places these
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