In the BD comparison, compared with the control, the expression of one SQLE (squalene monooxygenase) and one HYD1 (cholestenol delta-isomerase) gene was upregulated; in contrast, the expression of one SMO1 (plant 4,4-dimethylsterol C-4alpha-methyl-monooxygenase) and one DWF1 (delta24-sterol reductase) gene was downregulated under B deficiency. The gene discussed is EVC; the disease is Behcet disease.