Inhibition of axonal transport leads rapidly to loss of function in the distal axon, and dying back neuropathies are frequently associated with chronic exposure to neurotoxins that inhibit axonal transport. Some of these neurotoxins may act directly on the motor molecules that underlie axonal transport. For example, acrylamide has been found to inhibit kinesin function. Others may indirectly affect the delivery of materials by transport through effects on energy metabolism or by blocking conversion from anterograde to retrograde transport.