A “Critical Perspectives” article in the Journal of Bioethical Inquiry on scientific integrity in Brazil summarizes several misconduct cases documented therein . To further reinforce the responsible conduct of research in developing countries and to fight against the unaccountability of many editors , we describe here a Mexican instance of alleged in-house plagiarism .In June 2011, we submitted a “Correspondence” note to a Nature group journal to expose what we claimed to be a breach of collegiality and inappropriate authorship in (...) a three-page mutation report just published in that journal. Our main complaints were two: the surreptitious way in which we believed that both displayed metaphases in that report had been obtained from our files by a local colleague and then published without our consent and the massive easy-on co-authorship: 14 out of 21 co-authors declared just to have “provided clinical material.” In c .. (shrink)