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[Ethical aspects of biomedical research. frequent concepts in written norms].

Most codes and declarations pertaining to the ethics of research involving human subjects have been formulated in response to specific events mostly of a painful or embarrassing nature. Several concepts appearing repeatedly in their texts are highlighted in this paper: principles of respect for persons, beneficence and justice, vulnerability and research propriety. Along with some comments on current revisions of many international guidelines and the role of bioethics committees, a plea is made to have a proactive rather than a reactive stance in ethical regulation of biomedical research.