Final answer:
Chemokines are chemotactic substances that draw neutrophils to the site of infection, helping with phagocytosis of pathogens and tissue repair.
Step-by-step explanation:
Chemotactic substances that may draw neutrophils to the site of infection include chemokines. Chemokines are chemotactic cytokines that recruit specific subsets of leukocytes, including neutrophils, to infections, damaged tissue, and sites of inflammation.
For example, leukotrienes are particularly good at attracting neutrophils from the blood to the site of infection by chemotaxis.
Therefore, chemokines play an important role in the immune response by attracting neutrophils to the site of infection where they can help phagocytose pathogens and promote tissue repair.