And blood? It is a conglomerate of organs, a system of systems. It has built training camps for its armies (lymph nodes), highways and alleys to move its cells (blood vessels). It has citadels and walls that are constantly being surveyed and repaired by its residents (neutrophils and platelets). It has invented a system of identification cards to recognize its citizens and eject intruders (T cells) and an army to guard itself from invaders (B cells). It has evolved language, organization, memory, architecture, subcultures, and self-recognition. A new metaphor comes to mind. Perhaps we might
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