code: public Chemicals getLigand() {
      if (GeneRegulationTemplate_Type.featOkTst && ((GeneRegulationTemplate_Type)jcasType).casFeat_ligand == null)
        jcasType.jcas.throwFeatMissing("ligand", "de.julielab.jules.types.bootstrep.GeneRegulationTemplate");
      return (Chemicals)(jcasType.ll_cas.ll_getFSForRef(jcasType.ll_cas.ll_getRefValue(addr, ((GeneRegulationTemplate_Type)jcasType).casFeatCode_ligand)));}
docs: getter for ligand - gets chemical particpating in the gene regulation process
  @generated
  @return value of the feature