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Coagulase is a protein enzyme produced by several microorganisms that enables the conversion of fibrinogen to fibrin. In the laboratory, it is used to distinguish between different types of Staphylococcus isolates. Importantly, S. aureus is generally coagulase-positive, meaning that coagulase negativity usually excludes S. aureus. However it is now known that not all S. aureus are coagulase-positive.
inducer. [indoÌoÌâ²sÉr]. a substance, usually a substrate of a specific enzyme, that combines with and inactivates the repressor produced by a regulator gene in bacteria. This combination prevents the repressor from blocking activation of the operator gene, allowing one or more structural genes to be transcribed.. One that induces, especially a molecule that is usually a substrate of a specific enzyme pathway, combining with an active repressor produced by a regulator gene to deactivate the repressor. 2. A part or structure in an embryo that influences the differentiation of another part.