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Schematic diagram of neuron B21 and its postsynaptic follower, neuron B8. B21 is a radula mechanoafferent that is peripherally activated when a mechanical stimulus is applied to the tissue it innervates, the subradula tissue (SRT). Subthreshold depolarization of the somatic region of B21 (gray) potentiates sensorimotor transmission. As shown in the schematic at right, this is a graded phenomenon. Since this is a schematic, scale bars give approximate values.
