This paper attends to writing practices by way of examining how a professional regulator engages with research activities conducted by doctors. In order to explore regulatory responses to alleged research misconduct, I use a specific calligraphic practice shared by researchers and regulators. The paper shows that taking this calligraphic practice as an analytical focus can offer surprising dividends to the study of regulation across fields. Via the practice of strikethrough, the General Medical Council effectuates three gestures as it engages with research activities: display, authentication and isolation. Understanding them requires asking what literal and metaphorical meanings travel in the strikethrough.