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.
Arabic is the official language of 26 Middle Eastern and North African countries spanning Yemen to Lebanon to the Sudan to Tunisia, it is an official language of the the Arab League, the African Union, NATO, and the United Nations, and it is the liturgical and intellectual language of Islam.