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a structurally distinct and ordered collection of enzymes, often catalyzing successive steps in a metabolic pathway (for example, pyruvate dehydrogenase complex).
1. the sum or combination of various things, like or unlike, as a complex of clinical signs.
2. that portion of an electrocardiographic tracing that represents the systole of an atrium or ventricle.
a complex formed by the combining of antibody and antigen. Called also immune complex.
a complex cellular organelle involved in the synthesis of glycoproteins, lipoproteins, membrane-bound proteins and lysosomal enzymes. See also golgi apparatus.
major histocompatibility complex (MHC)
see major histocompatibility complex.
the bringing together of all of the enzymes involved in a series of reactions such that the product of enzyme A is passed directly to enzyme B and so on to the final product.
olivary nuclear complex
gray matter located in the medulla oblongata dorsal to the pyramidal tracts; an important part of the motor feedback regulatory mechanism.
the combination of a parenchymal pulmonary lesion and a corresponding lymph node focus, occurring in primary tuberculosis. Similar lesions may also be associated with other mycobacterial infections and with fungal infections.