CD79A and vitamin D deficiency: On the other hand, in a cross-sectional study performed on 200 Saudi adolescent girls (range of age 13–19 years) with vitamin D deficiency, participants with serum 25(OH)D3 < 50 nmol/l had positive tTG IgA antibodies 37.2 times higher compared to those with higher vitamin D levels, suggesting the need for screening for CeD asymptomatic patients with severe-to-extreme vitamin D deficiency [218].