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.
The Arabian Peninsula itself was not entirely originally Arabic. Arabization occurred in some parts of the Arabian Peninsula. For example, the language shift to Arabic displaced the indigenous South Semitic Old South Arabian languages of modern-day Yemen and southern Oman.he Arabs of North Africa are descendants of Arabian tribes of Banu Hilal native of Middle East and of others tribes native of Saudi Arabia, Yemen and Iraq. Arabs and Arabic-speakers inhabit plains and cities.