Before revision:  Several interesting results are reported, including the identification  of linearity in the transfer functions , as well as the identification of regions in the parameter space characterized by sharper transfer functions  .
After revision:  Several interesting results are reported, including the identification of linearity in the transfer functions , as well as the identification of regions in the parameter space characterized by sharper transfer functions . These properties can be used to facilitate simulations under certain circumstances and to validate the model by comparison with biological results .