HBA2 and sickle cell disease: In case of Sickle cell disease patient, those with miR-423 CC genotype, the mean percentage levels for HbA1, HbA2, HbF and HbS reported were 64.53%, 3.36%, 0.64% and 35.6%, respectively, whereas among SCD patients with miR-423 AA genotype, the mean percentage levels were 65.9%, 4.40%, 0.60% and 36.1%, respectively (Table 7).