Immune System questions regarding t cells

37.   T cells recognize antigens by binding to _______ proteins on an antigen presenting cell such as a dendritic cell.  This process is known as ____________ selection.  If T cells fail to recognize this protein, they die by a process known as ____________. 


38.   If a T cell recognizes this protein (the one mentioned above), it is then tested for recognition of ___________________ the body’s own antigens.  This process is known as _________________ selection.  Immature T cells that do not recognize the body’s own antigens are called __________________ and allowed to mature.