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ROOT. That part of a tree or plant under ground from which it draws most of its nourishment from the earth.
     2. When the roots of a tree planted in one man's land extend into that of another, this circumstance does not give the latter any right to the tree, though such is the doctrine of the civil law; Dig. 41, 1, 7, 13; but such person has a right to cut off the roots up to his line. Rolle's R. 394, vide Tree.
     3. In a figurative sense, the term root is used to signify the person from whom one or more others are descended. Vide Descent; Per stirpes.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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The decrease in glutathione levels in nerve (2), spinal cord (28), dorsal root ganglion, dorsal root and ventral root of experimental rats represents increased susceptibility to oxidative stress and hyperalgesia.
To explore whether there is a preferred direction of propagation for this wave of activity, we stimulated a ventral root near the proximal end of the preparation and afterwards one near the distal end (schematically shown in the insets in Fig.
Motor nerve axons exit the ventral white matter as the ventral roots of the spinal nerves.

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