EDIT

        $derivedUnitFacadeInstance = cdm_ws_get(CDM_WS_DERIVEDUNIT_FACADE, $type_designation->typeSpecimen->uuid);

      }

        $specimen_markup = $derivedUnitFacadeInstance->titleCache;

        if($link_to_specimen_page && isset($derivedUnitFacadeInstance->specimenLabel) && $derivedUnitFacadeInstance->specimenLabel){

          $specimen_markup = str_replace($derivedUnitFacadeInstance->specimenLabel, l($derivedUnitFacadeInstance->specimenLabel, path_to_specimen($type_designation->typeSpecimen->uuid)), $specimen_markup);