p627tbl17.01 Homologs between reaction-diffusion and recurrent shunting cellular network models of development.<BR>||  byRows: (reaction-diffusion, recurrent shunting net)  (activator, excitatory activity)  (inhibitor, inhibitory activity)  (morphogenic source density, inputs)  (firing of morphogen gradient, contrast enhancement)  (maintenance of morphogen gradient, short-term memory)  (power or sigmoidal signal functions, power or sigmoidal signal functions)  (on-center off-surround interactions via diffusion, on-center off-surround interactions via signals)  (self-stabilizing distributions of morphogens if inhibitors equilibrate rapidly, short-term memory pattern if inhibitors equilibrate rapidly)  (periodic pulses if inhibitors equilibrate slowly, periodic pulses if inhibitors equilibrate slowly)  (regulation, adaptation).