Figure 1From: Examining smoking-induced differential gene expression changes in buccal mucosa Representative qPCR matched blood and buccal mucosa samples. The buccal RNA (cheek) appears to be heavily degraded compared to the blood RNA since there is no evidence of 18 or 28S rRNA peaks and the bulk of material is migrating rapidly indicating small size. RIN, RNA integrity number; NA, no RIN determination possible.Back to article page