Feem ntau, cov kauv hniav barbed hlau feem ntau yog ntsia rau ntawm lub laj kab, thiab cov kauv hniav barbed hlau muab faib ua ob hom: ib leeg helix thiab ob chav helix. Tsis tas yuav muaj lub nplhaib tuav hauv kev tsim cov helix nkaus xwb, uas tau teeb tsa hauv nws cov duab ntuj.
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