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. 2021 Dec 28;8(1):e000813. doi: 10.1136/bmjgast-2021-000813

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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CYP1A1 expression in one to two colon tissues each from seven patients, measured by quantitative real-time PCR. The black line indicates average normalised baseline expression and the red line marks the average normalised increase (12 557-fold). Error bars represent propagated errors from CYP1A1 (n=4) and 18S (n=4) levels measured simultaneously for sample normalisation. CYP1A1, cytochrome P450 1A1.