def model Casr as
    def import using "../cellLib/Components/units.cellml" for
        unit uM using unit uM;
        unit uM_per_s using unit uM_per_s;
    enddef;

    def comp Casr as
        var J_SERCAi: uM_per_s {pub: in};
        var J_CICRi: uM_per_s {pub: in};
        var J_leaki: uM_per_s {pub: in};
        var t: second {pub: in};
        var si_init: uM {pub: in};
        var s_i: uM {init: si_init, pub: out};

        ode(s_i,t)=J_SERCAi-J_CICRi-J_leaki;

    enddef;

enddef;