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A null allele is a gene variant that lacks the gene's normal function because it either is not expressed, or the expressed protein is inactive. For example, at the gene locus for the ABO blood type carbohydrate antigens in humans, [13] classical genetics recognizes three alleles, I A, I B, and i, which determine compatibility of blood transfusions.
The Le gene encodes a fucosyltransferase that adds fucose to type 1 precursor substance (both free in serum and in secretions) to make the Le(a) antigen. The le gene is an amorph. The Lewis antigen produced on free type 1 precursor substance passively adsorbs onto the surfaces or red blood cells. [2]
An antibody can be called monospecific if it has specificity for a single antigen or epitope, [75] or bispecific if it has affinity for two different antigens or two different epitopes on the same antigen. [76] A group of antibodies can be called polyvalent (or unspecific) if they have affinity for various antigens [77] or microorganisms. [77]
A gene signature or gene expression signature is a single or combined group of genes in a cell with a uniquely characteristic pattern of gene expression [1] that occurs as a result of an altered or unaltered biological process or pathogenic medical condition. [2] This is not to be confused with the concept of gene expression profiling.
Only one type of light chain is present in a typical antibody, thus the two light chains of an individual antibody are identical. Each light chain is composed of two tandem immunoglobulin domains: one constant (C L) domain; one variable domain (V L) that is important for binding antigen
The part of the antigen that immunoglobulin or antibodies bind to is called a B-cell epitope. [11] B cell epitopes can be divided into two groups: conformational or linear. [11] B cell epitopes are mainly conformational. [12] [13] There are additional epitope types when the quaternary structure is considered. [13]
Termed a dihybrid cross or “two-gene test cross”, this experiment was grounded in the principle of segregation. When conducting a dihybrid test cross, two dominant phenotypic characteristics are selected and crossed with parents displaying double recessive traits. The phenotypic characteristics of the F1 generation are then analyzed.
Two chains, called α & β, whose ligands are the CD4 receptors borne by helper T cells. III: Other immune proteins, outside antigen processing and presentation, such as components of the complement cascade (e.g., C2, C4, factor B), the cytokines of immune signaling (e.g., TNF-α), and heat shock proteins buffering cells from stresses Various