短语词组短語thermal asymmetric interlaced pcr 溫度不對稱pcrthermal asymmetric interlaced pcr tail -pcr 熱不對稱嵌套pcrtouchdown asymmetric PCR touchdown 不對稱PCRasymmetric PCR hybridization 不對稱PCR襍交asymmetric PCR -SSCP 不對稱PCR 返回 asymmetric pcr