Mutations in the MT-CYB gene found in mitochondrial DNA can cause mitochondrial complex III deficiency. When caused by mutations in this gene, the condition is usually characterized by muscle weakness (myopathy) and pain, especially during exercise (exercise intolerance).
Hejazi Arabic, also known as Western Arabian Arabic, is a variant of the Arabic language spoken predominantly in the western region of Saudi Arabia. The language is spoken by approximately 8 million Saudi nationals, as of the last census.
1 Arabic is today spoken by more than 200 million people in the Arab World, and it is an official language in 22 countries. 2  Arabic is also an important language in many countries bordering on the Arab World, like Mali, Niger, Chad, Eritrea, Djibouti, Ethiopia and Somalia.