import nsrunit;
unit conversion on;
unit s=1 second^1;
unit uM=1E-3 meter^(-3)*mole^1;
unit per_s=1 second^(-1);

math main {
	//Warning:  the following variables were set 'extern' or given
	//  an initial value of '0' because the model would otherwise be
	//  underdetermined:  t
	extern real t s;
	real L uM;
	real Ls uM;
	Ls=0.100;
	real ts s;
	ts=10;

	// <component name="ligand">
	L=(if ((t<(ts+(.15 s))) and (t>=ts)) Ls/(1+exp(((-80 per_s))*(t-ts-(.05 s)))) else if (t>=(ts+(.15 s))) Ls else (0 uM));
}