Dear All,

Apologies, I've just realised that two of the above terms multiply out, so that the equations above are sadly more complex than I thought, and should have been posted as:

dA/dt = m + o * C - A * ((p * x * (B + D) / (A + B + C + D + E + F)) + (q * x * (D + E +F) / (A + B + C + D + E + F)) + n)

dB/dt = p * A - B * (s + (q * x * (D + E +F) / (A + B + C + D + E + F)) * r + n)

dC/dt = s * B - C * ((q * x * (D + E +F) / (A + B + C + D + E + F)) + o + n)

dD/dt = (q * x * (D + E +F) / (A + B + C + D + E + F)) * A + o * F - D * ((p * x * (B + D) / (A + B + C + D + E + F)) * t + u + n)

dE/dt = (p * x * (B + D) / (A + B + C + D + E + F)) * t * D + (q * x * (D + E +F) / (A + B + C + D + E + F)) * r * B - E * (s * v + u + n)

dF/dt = s * v * E + (q * x * (D + E +F) / (A + B + C + D + E + F)) * C - F * (o + u + n)

Sorry for any inconvenience, and any help much appreciated.

Thanks,

Z