CELLS& ORGANS OF IMMUNE MECHANISM. Origin & structure. IMMUNE CELLS. Fetal liver -------------yolk cells Blood cell precursors. Stem cells reside in bone marrow. Erythroid, myeloid& lymphoid series. Lymphocyte populations. T-Lymphocytes (cytotoxic &helper T-cells).
Origin & structure.
Fetal liver -------------yolk cells
Blood cell precursors.
Stem cells reside in bone marrow.
Erythroid, myeloid& lymphoid series.
If these molecules were more similar, our ability to accept foreign grafts would be correspondingly improved.
MHC genes and proteins are also important in two other medical contexts.
The results of many immunologic tests are expressed as a titer, which is defined as the highest dilution of the specimen e.g. Serum that gives a positive reaction in the test serum.
In this test the antigen is particulate (eg, bacteria and red blood cells)
Antibody because it is divalent or multivalent , cross-links the antigenically multivalent particles and forms a lattice work, and clumping (agglutination) can be seen.
eg. ABO blood group test is agglutination