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.
*Tunisia: Tunisian Arabic. *Mauritania: The official language of the country is Arabic, but common people of Arab-Berber origin use a distinct variety known as. Many people in the south of the country speak one of the national languages, such as Pulaar, Soninke or Wolof. These are also spoken in Senegal.