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The immune system’s answer to the Marine Corps. Aggressive, relentless, and ferociously dedicated to the eradication of pathogens, these warriors’ bodies enlarge in anticipation of violence, and they have a number of weapons they can deploy in battle. Macrophages have tentacle-like pili that enable them to grasp foes and pull them into their acid-filled abdominal cavities, which reduce infected cells to recyclable organic pus.