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A graph showing typical behaviour of the model, where the proportion of cells is scaled to a maximum of 1.25×1010 (where parameters ly=20.0, hy=10−11, hf=1.56×1010, m=10, b=4.789×1020, kxy=1.48, kyx=0.26, X(0)=105). Solid line, X; short dashed line, Y; dotted line, U; long dashed line, F.
