| FAB | fast atom bombardment; formalin ammonium bromide; fragment, antigen-binding [of immunoglobulins]; Fr... |
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| Fab | fragment, antigen-binding [of immunoglobulins] |
| FAB classification | French, American, British classification |
| F(ab')2 | fragment, antigen-binding [of immunoglobulins] |
| Fabc | fragment, antigen and complement binding [of immunoglobulins] |
| FAB | Fast Atom Bombardment |
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| FAB-MS | Fast Atom Bombardment Mass Spectrometry |
| FAB MS | Fast Atom Bombardment Mass Spectroscopy |
| FAB | French American British |
| SIgA | Secretory immunoglobulins A |
| immunoglobulins, fab | Antigen-binding fragments composed of one entire light chain and about half of one of the heavy chains, linked to each other by disulfide bonds. Fab contains the antigen binding site which is part of the variable region of the immunoglobulin molecule. (12 Dec 1998) |
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| Fab | <immunology> Fragment of immunoglobulin prepared by papain treatment. Fab fragments (45 kD) consist of one light chain linked through a disulphide bond to a portion of the heavy chain and contain one antigen binding site. They can be considered as univalent antibodies. (18 Nov 1997) |
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| FAB classification | <haematology> The classification of acute myeloid leukaemia on the basis of bone marrow and peripheral blood features. M0: Acute myeloid leukaemia with minimal evidence of myeloid differentiation. M1: Acute myeloblastic leukaemia. M2: Acute myeloblastic leukaemia with differentiation. M3: Acute promyelocytic leukaemia. M4: Acute myelomonocytic leukaemia. M5: Acute monocytic leukaemia. M6: Acute erythroleukaemia. M7: Acute megakaryocytic leukaemia. Acronym: FAB (07 Apr 1998) |
| Fab fragment | The antigen-binding fragment of an immunoglobulin molecule, consisting of both a light chain and part of a heavy chain. Synonym: Fab piece. (05 Mar 2000) |
| Fab piece | The antigen-binding fragment of an immunoglobulin molecule, consisting of both a light chain and part of a heavy chain. Synonym: Fab piece. (05 Mar 2000) |
| immunoglobulins | Any of the structurally related glycoproteins that function as antibodies. They are divided into five classes (IgA, IgD, IgE, IgG, IgM) on the basis of structure and biological activity. (12 Dec 1998) |
| immunoglobulins, alpha-chain | Heavy chains found in the fab and fc fragments of IgA and having a molecular weight of approximately 58 kD. They contain about 470 amino acid residues arranged in four domains and an oligosaccharide component bound covalently to the fc fragment. (12 Dec 1998) |
| immunoglobulins, delta-chain | Heavy chains found in the fab and fc fragments of IgD and having a molecular weight of approximately 64 kD. They contain about 500 amino acid residues arranged in four domains and an oligosaccharide component covalently bound to the fc fragment. (12 Dec 1998) |
| immunoglobulins, epsilon-chain | Heavy chains found in the fab and fc fragments of IgE and having a molecular weight of approximately 72 kD. They contain about 550 amino acid residues arranged in five domains and about three times more carbohydrate than the heavy chains of IgA, IgD, and IgG. (12 Dec 1998) |
| immunoglobulins, fc | Crystallizable fragments composed of the carboxy-terminal halves of both heavy chains linked to each other by disulfide bonds. Fc fragments are responsible for the effector functions of antibodies (complement fixation, binding to cell membranes, and placental transport). (12 Dec 1998) |
| immunoglobulins, gamma-chain | Heavy chains found in the fab and fc fragments of IgG and having a molecular weight of approximately 51 kD. They contain about 450 amino acid residues arranged in four domains and an oligosaccharide component covalently bound to the fc fragment. The gamma chains of the four IgG subgroups are not identical, but resemble each other more closely than the heavy chains of a different immunoglobulin. (12 Dec 1998) |
| immunoglobulins, heavy-chain | Major components of immunoglobulin molecules. They are the larger of the two types of polypeptide chains responsible for the biological and immunological properties of the different immunoglobulins. They differ according to the class of ig from which they were isolated, contain 450 to 600 amino acid residues per chain, and have molecular weights of 51-72 kD. One ig molecule comprises two heavy and two light chains. (12 Dec 1998) |
| immunoglobulins, intravenous | Immunoglobulin preparations used in intravenous infusion, containing primarily IgG. They are used to treat a variety of diseases associated with decreased or abnormal immunoglobulin levels including paediatric aids, primary hypergammaglobulinaemia, scid, cytomegalovirus infections in transplant recipients, chronic lymphocytic leukaemia, kawasaki syndrome, infection in neonates, and idiopathic thrombocytopenic purpura. (12 Dec 1998) |
| immunoglobulins, j-chain | The immunoglobulin fragments found in the light chain fractions of secretory IgA and polymeric IgM in a ratio of one j chain per one IgA dimer or one IgM pentamer. It is a polypeptide with a molecular weight of about 17 kD and probably serves either to bind the components of the globulins together or to transfer the globulins across membranes. (12 Dec 1998) |
| immunoglobulins, kappa-chain | One of the light chains of the immunoglobulins with a molecular weight of approximately 22 kD. They constitute about 60% of all light chains and can be recognised serologically as well as by their specific amino acid sequence. (12 Dec 1998) |
| immunoglobulins, lambda-chain | One of the light chains of the immunoglobulins with a molecular weight of approximately 22 kD. They constitute about 40% of all light chains and can be recognised serologically as well as by their specific amino acid sequence. (12 Dec 1998) |
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