Figure 4From: Host stress hormone norepinephrine stimulates pneumococcal growth, biofilm formation and virulence gene expression Involvement of PspA and PspC in norepinephrine uptake. Panels A-C show 3H-NE uptake pspA, pspC and pspAC mutants after 24 hrs incubation in serum-medium as described in Methods in the presence (grey) and absence of NE (black); P < 0.05. Values shown are means of triplicate counts; for all experiments, n = 3.Back to article page