[ Diff(x[1], t) = (1*k[1]*k[11] + (-1)*k[2]*x[1]*x[6]*1/1000 + (-2)*k[3]*x[1]*(x[1] - 1)*1/2 + 2*k[4]*x[2] + (-1)*k[7]*x[1]*x[3]^2/(k[8]^2 + x[3]^2) + 1*k[5]*x[3])/k[10],
  Diff(x[2], t) = (1*k[3]*x[1]*(x[1] - 1)*1/2 + (-1)*k[4]*x[2] + (-2)*k[6]*x[2]*(x[2] - 1)*1/2)/k[10],
  Diff(x[3], t) = (4*k[6]*x[2]*(x[2] - 1)*1/2 + 1*k[7]*x[1]*x[3]^2/(k[8]^2 + x[3]^2) + (-1)*k[5]*x[3])/k[10],
  Diff(x[4], t) = 0,
  Diff(x[5], t) = 0,
  Diff(x[6], t) = (-1)*k[9]*x[6]/k[10] ]