begin name
ribeiro1
end name

begin reactions
v1 {1.0}$EXTERNAL = {1.0}Nplus
v2 {1.0}Nplus = {1.0}$EXTERNAL
v3 {1.0}$EXTERNAL = {1.0}NN
v4 {1.0}$EXTERNAL = {1.0}NN
v5 {1.0}NN = {1.0}$EXTERNAL
end reactions

begin rate equations
v1 = alpha*sigma
v2 = dN*Nplus[t]
v3 = sigma
v4 = p*NN[t]
v5 = dN*NN[t]
end rate equations

begin parameters
alpha = 0.125
dN = 0.001
p = 0.00092
sigma = 0.032
default = 1.0
end parameters

begin initial conditions
NN[0] = NNi
Nplus[0] = Nplusi
end initial conditions

begin initial values
NNi = 10.0
Nplusi = 0.0
end initial values

begin assignment rules
ratio := Nplus[t]/NN[t]
end assignment rules

begin function definitions
end function definitions

begin events
end events

begin process annotations
end process annotations

begin species annotations
end species annotations

begin units
end units