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.
Classical Arabic is the language of the Qur'an. Arabic is closely associated with the religion of Islam because the Qur'an was written in Arabic, but it is nevertheless also spoken by Arab Christians, Mizrahi Jews and Iraqi Mandaeans.