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We cannot yet match the high degree of reliability that biological systems possess when building electronic systems, no matter how intelligent they are. While proposals to date to solve this problem have demonstrated the feasibility of the bio-inspired approach, the resulting systems were often unduly complex. This paper presents a radically new approach to building fault tolerant systems. It proposes a novel model that uses the characteristics and behaviour of unicellular organisms, such as those of bacteria and bacterial communities, to construct highly reliable electronic systems with online fault repair properties. It demonstrates the feasibility of using bio-inspired cellular arrays with built-in self-diagnostic and self-repair capability to construct complex electronic systems.