(i) MALT stands for Mucosa Associated Lymphoid Tissue. It is located within the lining of respiratory, digestive and urogenital tracts in our body.
(ii) Cytokine barriers are one of the four types of barriers of innate immunity. Interferons are example of cytokine barriers, secreted from virus infected cells, which protect non-infected cells from further viral infections.
(iii) ELISA i.e. Enzyme Linked Immuno Sorbent Assay is the widely used diagnostic test for AIDS. It works on the principle that involves antigen-antibody interaction.
(iv) Both bone marrow and thymus are the primary lymphoid organs where immature lymphocytes differentiate into antigen-sensitive lymphocytes. Both bone marrow and thymus provide micro-environments for the development and maturation of T-lymphocytes.
The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.
