Answer:
Antimicrobial peptides
Step-by-step explanation:
Antimicrobial peptides may be defined as the important part of immune system that provide protection against the pathogens. These peptides are also known as host defense peptides.
Defensin and bacteriocins are the antimicrobial peptide. Defensin are cysteine rich protein that provide protection against bacteria, virus and cancer cells. Bacteriocin peptide is present in bacteria that inhibit the growth of the same strains of bacteria.
Thus, the correct answer is option (4).