function continuous_labeling
    %Pichia secretion model
    
    %%starting values
   
    IH0=[0 %Fab intracellular
        0] % Fab extracellular
  
   %% Constants 
   qASS = 143.1  % intracellular Fab3H6 formation rate (µg Fab * BTS-1 * h-1)
   KSEC= log(2)/(75.3/60)  % secretion constant (h-1); half time = 75.3 min
   KDEG= log(2)/(45.8/60)  % degradation constant (h-1); half time = 45.8 min
   D= 0.1 % dilution rate (h-1)
   BTS= 25  % biomass dry mass (g L-1)
    
 
   %% function call - ordinary differential equation (ode), arguments
   %% timespan, vector ofinitial conditions (IHO)
   %% ode15s algorithm = Implicit linear multistep, orders 1 to 5
   tf=50; 
   [t Y]=ode15s(@ODEPPa00,[0 tf],IH0); %timespan 0 - tf
    
   %% Plot Y in dependence of t
   plot(t,Y);
   legend('Fab intracellular','Fab extracellular','Location','NorthOutside')

    function DHH=ODEPPa00(t,h) 
        DHH=SSODEPPa00(h);
    end

    function DHH=SSODEPPa00(h)   
        FabI=h(1); % µg gBTS-1
        FabM=h(2); % µg gBTS-1
           
        DHH=zeros(2,1);
        DHH(1)=qASS-KSEC*FabI-KDEG*FabI-D*FabI; % intracellular Fab
        DHH(2)=KSEC*FabI-D*FabM; % extracellular Fab
              
    end

end