When an antigen such as a enters the body, the immune system responds in two ways. the nonspecific response mobilizes white blood cells to surround and destroy the invading antigens. those white bloods cells release?

These white bloods cells release antibodies. The antibodies are proteins that are produced by a B cell and binds specifically to a particular antigen. The antigens are characteristic protein or other molecule produced by an invading pathogen that is recognized as alien by particular lymphocytes and that incites B cells to produce antibodies directed against it. 

~potters6/te801/biology/biounits/respiration.htm