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Expression of CK6B (A), CK5 (B), p63 (C), and DSG3 (D) in the micro array data. Blue, black, and green colors represent expression in AD, SQCC, and in non-neoplastic lung adjacent to AD. The on/off threshold values for genes (horizontal lines) were found by plotting histograms of expression values and identifying the noise floor (see supplemental Figure S1 at http://ajp.amjpathol.org).
