In September 2001, Genome Technology pointed to a report in its sister publication BioInform that detailed how the Public Library of Science's Michael Eisen and 25,000 of his supporters had issued an ultimatum to several top-tier journals — at the time, they pledged to publish in, edit or review for, and subscribe to only those publications that agreed to deposit all articles in PubMed or another freely accessible resource within six months of their initial publication.