Navigable waters of the United States are those waters that are subject to the ebb and flow of the tide and/or are presently used, or have been used in the past, or may be susceptible for use to transport interstate or foreign commerce.
The Signs & Symptoms of Friedreich's Ataxia are: 1  loss of coordination (ataxia) in the arms and legs. 2  fatigue - energy deprivation and muscle loss.  vision impairment, hearing loss, and slurred speech.
Reference from A.D.A.M. Spinocerebellar degeneration. Friedreich's ataxia is caused by a defect in a gene called Frataxin (FXN). This gene is located on chromosome 9. Changes in this gene cause the body to make too much of a part of DNA called trinucleotide repeat (GAA). Normally, the body contains about 8 to 30 copies of GAA.