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Oscillator based on Predator Prey dynamics. We are creating a molecular system which is able to show oscillations which can be described by the lotka-volatra equations. The molecular oscillations are powered by two distinct cell populations, one which drives the predator and a second driving the prey. This flexible design will allow us to alter the amplitude and wavelength of the oscillator by changing the relative population sizes. The system uses quorum sensing to create culture wide synchronised oscillations of N-acyl homoserine lactone. The system is working in models using realistic values and we are currently devising ways to test the bio-bricks to analyse how their performance affects our models .