Histology. an enzyme, isolated from horseradish, that when microinjected can be detected by the colored products of the reaction it catalyzes, used as a tracer, as in tracing the route of a motor neuron from the cell body in the spinal cord to the muscle it innervates.

horseradish peroxidase horse·rad·ish peroxidase (hôrs’rād’ĭsh)
An enzyme used in immunohistochemistry to label the antigen-antibody complex.


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