c0 0[mol/m^3] Initial concentration in the chamber
cs0 0[mol/m^2] Initial concentration on the boundary
D 1e-8[m^2/s] diffusion coefficient
vin 3[ml/min] inflow rate
paracrine 8e-7[mol/m^2/s] autocrine production of c from cells
tau 0.05[s] half-life of morfogens
kon 30[m^3/s/mol] association rate constant
Rt 1e-8[mol/m^2] total number of receptors
koff 6e-4[1/s] dissociation rate