Latvian[edit] From an earlier abu, still dialectally attested (abi was originally the feminine/neuter dual form), from Proto-Baltic *abu, from Proto-Indo-European *a(m)-bÊ°ou, where the initial part is an old deictic pronoun or particle, reinforcing the meaning âtwo, bothâ of the second part.
Parkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra.When functioning normally, these neurons produce a vital brain chemical known as dopamine.arkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra.
However, only about 10 percent of Parkinson's cases have been linked to a genetic cause. Most cases of Parkinson's are called idiopathic or sporadic, meaning the cause is unknown, and researchers believe onset is due to a combination of genetic and environmental factors. Another gene that plays a role in some people's Parkinson's is LRRK2.