PTK2 and infection: The specific FAK inhibitor PF 573228 blocked invasion by N. meningitidis MC58 siaD efficiently in a dose-dependent manner (>90% inhibition with 1 μM PF 573228 at 4 h post-infection (p.i.)and about 94% inhibition with 1 μM PF 573228 [P<0.01] at 8 h p.i.)(Fig. 2).