| cluster headache | <symptom> A term used to describe a headache that is typified by constant, unilateral pain around the eye, with onset usually within 2-3 hours of falling asleep. Can be accompanied by a blocked nasal passage, runny nose, and-or tearing. One may also notice facial flushing, ptosis (dropping eyelid), facial swelling and constriction of the pupils. (27 Sep 1997) |
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| cluster of differentiation | Cell membrane molecules that are used to classify leukocytes into subsets. CD molecules are classified by monoclonal antibodies. (05 Mar 2000) |
| cluster of differentiation 2 | A glycoprotein that is expressed on all peripheral T-cells, large granular lymphocytes and most, but not all, thymocytes. CD2 is involved in signal transduction and cell adhesion. (05 Mar 2000) |
| cluster of differentiation 3 | A complex of 5 polypeptides associated with the T-cell receptor and is involved in signal transduction. (05 Mar 2000) |
| cluster of differentiation 4 | A glycoprotein found on various subsets of T-cells, i.e., usually no helper and some T cytotoxic cells. (05 Mar 2000) |
| cluster of differentiation 8 | Membrane glycoprotein found on subsets of T lymphocytes. CD8 is expressed on T cytotoxic cells and T suppressor cells. Acronym: CD (05 Mar 2000) |
| clusterin | <protein> Vertebrate glycoprotein of uncertain function. Secreted as a 400 amino acid peptide, then cleaved to form two 200 amino acid peptides that are linked by a disulphide bridge. Synonym: complement associated protein, complement cytolysis inhibitor, glycoprotein III. (11 Jan 1998) |
| clustering | Of acetylcholine receptors: aggregation of the receptors in developing myotubes in the vicinity of the presynaptic terminal, induced by nerve contact. See: agrin. (18 Nov 1997) |
| cluttering | A speech disorder usually occurring in childhood characterised by abnormally rapid rate, disturbed fluency, and erratic rhythm that makes it difficult to understand the speaker. (05 Mar 2000) |
| Clutton's joints | Symmetrical arthrosis, especially of the knee joints, in cases of congenital syphilis. (05 Mar 2000) |
| Clutton, Henry | <person> British surgeon, 1850-1909. See: Clutton's joints. (05 Mar 2000) |