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An enzyme based computer could live inside you and release drugs based on conditions going on - "The enzyme computer was used to perform two fundamental logic computations known as AND (where A and B must both equal one) and XOR (where A and B must have different values). The addition of two further enzymes - glucose oxidase and catalase - connected the two logical operations, making it possible to add together binary digits using the logic functions." [via] Link.
Related - Bioelectronics, From Theory to Applications.
