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Abstract
Biology is replete with examples of hormesis, the term introduced and developed by Calabrese. The corresponding concept in the field of peptide research has been characterized as the inverted U-shaped dose-response relationship. The articles by Calabrese in this issue summarize the notable progress occurring in the past three decades. In contrast to the skepticism encountered when we introduced this concept for peptides in the early 1970s, hormesis is now becoming recognized as characteristic of many actions of these small proteins. Calabrese is performing a considerable service by his strong advocacy and promotion of the concept to a more general readership. Hopefully, hormesis will be routinely considered in the design of research projects and the discovery of pharmaceutical agents.
