About the cover: Cover is based on a Masson's trichrome blue–stained cross section of a trachea from a Sprague-Dawley control (not fed alcohol) rat transplanted into a Fischer 344 rat. Donor alcohol ingestion exacerbates obliterative airway disease, depending on the degree of alloimmune mismatch. For more information, please see article by Mitchell and Guidot beginning on page 1161.