Following what he calls an "egregious" violation of scientific etiquette, a researcher has shut down a public Web site containing his team9s raw sequence data for Giardia lamblia, a diarrhea-causing protozoan. The researcher says he blocked public access 2 weeks ago to this federally supported DNA Web site after discovering that a colleague had published a paper using his team9s sequence information. He intends to restore the site (www.mbl.edu/Giardia) after the rules have been clarified and the data edited.