Identification of functional tumor necrosis factor-alpha promoter variants associated with Helicobacter pylori infection in the Sudanese population: Computational approach

Figure 2 Nucleotide variations of the tumor necrosis factor-alpha 5’-region (-584 to +107) in the Sudanese Helicobacter pylori-infected patients. A: PCR amplification results of the tumor necrosis factor-alpha 5’-region (-584 to +107) examined on 1% agarose gel electrophoresis; B: Multiple sequence alignment of the nucleotide sequences of the tumor necrosis factor-alpha 5’-region performed in Clustal W and visualized in Jalview[55]. The levels of identity are visible as histograms at the bottom.