begin name
somogyi1
end name

begin reactions
reaction0000001 {1.0}$EXTERNAL = {1.0}y
reaction0000002 {1.0}x = {1.0}y
reaction0000003 {1.0}y = {1.0}$EXTERNAL
reaction0000004 {1.0}x = {1.0}y
end reactions

begin rate equations
reaction0000001 = cytoplasm*gamma
reaction0000002 = cytoplasm*k*x[t] - ER*k1*y[t]
reaction0000003 = beta*extracellular*y[t]
reaction0000004 = alpha*cytoplasm*fy*x[t]
end rate equations

begin parameters
a = 3.0
alpha = 5.0
beta = 1.0
gamma = 1.0
k = 0.01
k1 = 2.0
n = 4.0
ER = 1.0
cytoplasm = 1.0
extracellular = 1.0
end parameters

begin initial conditions
x[0] = xi
y[0] = yi
end initial conditions

begin initial values
xi = 1.0
yi = 1.0
end initial values

begin assignment rules
fy := y[t]^n/(a^n + y[t]^n)
end assignment rules

begin function definitions
end function definitions

begin events
end events

begin process annotations
end process annotations

begin species annotations
x http://identifiers.org/chebi/CHEBI:29108
x http://identifiers.org/kegg.compound/C00076
y http://identifiers.org/chebi/CHEBI:29108
y http://identifiers.org/kegg.compound/C00076
end species annotations

begin units
end units