The University of Nebraska Medical Center has found no evidence of research misconduct after questions were raised about data integrity in an academic article.

The university made the announcement Friday after conducting an internal investigation. The review came after the American Journal of Respiratory and Critical Care raised questions about a study it published online in February 2012. The study was done jointly by UNMC and researchers from Temple University School of Medicine in Philadelphia.

The U.S. Department of Health and Human Services will review UNMC’s findings, as required by federal research-misconduct regulations. The university says it can provide another update once that review is complete.

The study in question examined the role of some proteins involved in a lung complication that is associated with the AIDS virus.