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Lewis antigens cannot be reliably detected until the 2nd birthday. Lewis antibodies in a pregnant woman are essentially totally insignificant because they are IgM subtype (don't cross the placenta) and Lewis antigen is weakly expressed during pregnancy (Lewis Le(a-b-) phenotype is commonly seen during gestation). [2]
Carbohydrate antigen 19-9 (CA19-9), also known as sialyl-Lewis A, is a tetrasaccharide which is usually attached to O-glycans on the surface of cells. It is known to play a role in cell-to-cell recognition processes. It is also a tumor marker used primarily in the management of pancreatic cancer. [1]
The term human blood group systems is defined by the International Society of Blood Transfusion (ISBT) as systems in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them", [1] and include the common ABO and Rh ...
Diagram of ABO blood antigen system. Created by me 9/11/06, released into public domain. Category:Medical diagrams: 10:36, 12 September 2006: 802 × 613 (483 KB) InvictaHOG~commonswiki: Diagram of ABO blood antigen system. Created by me 9/11/06, released into public domain.
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In immunology the particular macromolecule bound by an antibody is referred to as an antigen and the area on an antigen to which the antibody binds is called an epitope. In some cases, an immunoassay may use an antigen to detect for the presence of antibodies, which recognize that antigen, in a solution.
Sialyl Lewis X (sLeX), also known as cluster of differentiation 15s (CD15s) or stage-specific embryonic antigen 1 (SSEA-1), is a tetrasaccharide carbohydrate which is usually attached to O-glycans on the surface of cells. It is known to play a vital role in cell-to-cell recognition processes.