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.
Different Arabic varieties in the Arab world. There are many varieties of Arabic (dialects or otherwise) in existence. Arabic is a Semitic language within the Afroasiatic family that originated on the Arabian Peninsula. The largest divisions occur between the spoken languages of different regions.