The time course of BEC infected with S. aureus showed that the phosphorylation of GSK3α (Ser21) and GSK3β (Ser9) increased significantly after 40 min of infection (Figures 3A,B), GSK3α phosphorylation (~8-fold compared with control) being higher than GSK3β (~2.5-fold compared with control). This evidence concerns the gene GSK3A and infection.