Fig. 2From: Absence of high-risk HPV 16 and 18 in Chinese patients with oral squamous cell carcinoma and oral potentially malignant disordersStandard curves for HPV16 and HPV 18 E6. a Standard curves for 10-fold diluted HPV16 E6 plasmid DNA ranging from 0.1Â ng/well to 0.1Â pg/well; b Standard curves for 10-fold diluted HPV18 E6 plasmid DNA ranging from 1Â ng/well to 0.1Â pg/wellBack to article page