Table : Summary of binding affinities and in vitro activity of cP4_4 and its variants where the fluoroacetimidoyl ornithine (FAO) warhead was replaced by arginine (Arg4), citrulline (Cit4), acetimidoyl ornithine (Me4) or chloroacetimidoyl ornithine (Cl4). Surface plasmon resonance (SPR) data shows mean ± SEM of three independent replicates. COLDER data shows mean ± SEM of at least two independent replicates.