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<http://webisa.webdatacommons.org/264641942>	<http://www.w3.org/ns/prov#value>	" ??? ??? Interferons Anti-viral proteins secreted by lymphocytes. ??? ??? ??? Interleukins Proteins (cytokines) that stimulate the immune system including B & T cell lymphocytes. ??? ??? ??? Interstitial fluid Fluid that fills the spaces in between cells. ??? ??? ??? Kaposi sarcoma Malignant tumor of skin and connective tissue; associated with AIDS. ??? ??? ??? Lymph Fluid that circulates within l" .