The BioBrick circuit has been represented as a network in a figure yet to be uploaded. For every reaction indicated in imaginary figure, we have assumed a first order reaction rate. The reaction constants have been taken from literature. From this, we would then have a system of first order linear ordinary differential equations. This should be solvable and thus give us a prediction as to the nature of the oscillatory behaviour of a cell. To test the appropriateness of this model, we would then experimentally measure the expression of arbitrary protein and see how close it fits.