"Houses are not haunted. We are haunted, and regardless of the architecture with which we surround ourselves, our ghosts stay with us until we ourselves are ghosts."

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We can now determine, easily and relatively cheaply, the detailed chemical architecture of genes ; and we can trace the products of these genes ( enzymes and proteins ) as they influence the course of embryology . In so doing we have made the astounding discovery that all complex animal phyla - arthropods and vertebrates in particular - have retained, despite their half-billion years of evolutionary independence, an extensive set of common genetic blueprints for building bodies.

— Stephen Jay Gould