There are 4 types of sensory nerves in the periphery... 3 have myelinated axons and one does not. The reports on the skin biopsy can detail which are affected (diminished).
Neuroscience For Kids - conduction velocity
If you feel sick or worse using those substances at those doses, stop using them.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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