RPS6KB1 and infection: Quantitative analysis presented in Figure 1B clearly suggests an increase of about 3- to 4-fold in steady-state levels of phospho-p70 S6K on threonine 421/serine 424 in infected cells as early as 0.5 h and sustenance of this response up to 24 h post-infection in direct comparison to corresponding mock-infected controls (Figure 1A).