WASHINGTON, June 4 -- The U.S. Department of Health and Human Services National Institutes of Health announced that it expects to award a grant for transformative research on basic mechanisms of polysubstance use in addiction. The agency description of the grant states: "This Funding Opportunity Announcement (FOA) will support projects proposing mechanistic studies that will transform our understanding of polysubstance use in addiction. These hypothesis-based, exploratory projects may investiga more ST