These proteins as well as MRJPs demonstrate strong antimicrobial and bactericidal activities even against the most drug-resistant bacterial strains such as methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumoniae, vancomycin-resistant Enterococci, as well as extended-spectrum β-lactamase-producing Proteus mirabilis and Escherichia coli [28,29].