Nature Genetics 38, 525–527 (2006); published online 23 April; corrected after print 31 December 2006

In the version of this article initially published, several contributing authors were listed collectively under the name The FOP International Research Consortium. In order to facilitate the electronic citation of author contributions, the authors have chosen to delete the Consortium name and replace it with the names of the individual consortium authors in alphabetical order. The correct author list and affiliations are as follows:

Eileen M Shore1–3, Meiqi Xu1,2, George J Feldman1,2, David A Fenstermacher4–6, Tae-Joon Cho7, In Ho Choi7, J Michael Connor8, Patricia Delai9, David L Glaser1,2, Martine LeMerrer10, Rolf Morhart11, John G Rogers12, Roger Smith13, James T Triffitt14, J Andoni Urtizberea15, Michael Zasloff1,2,16,17, Matthew A Brown14,18 & Frederick S Kaplan1,2,19

1Center for Research in FOP & Related Disorders, 2Department of Orthopaedic Surgery, 3Department of Genetics, 4Department of Pathology and Laboratory Medicine, 5Abramson Cancer Center and 6Biomedical Informatics Facility, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA. 7Department of Orthopaedic Surgery, Seoul National University Children's Hospital, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul 110-744, Republic of Korea. 8Division of Developmental Medicine, Institute of Medical Genetics, University of Glasgow Medical School, Yorkhill Academic Campus, Glasgow G3 8SJ, Scotland, UK. 9Department of Orthopaedic Surgery, Santa Casa de Misericórdia de São Paulo School of Medicine, Rua Dr. Cesário Motta Jr. 112, Cep: 01221-020, São Paulo, Brazil. 10Department of Genetics, Hôpital Necker-Enfants Malades, INSERM U-781, 149 Rue de Sèvres, 75015 Paris, France. 11Department of Pediatrics, Klinikum Garmisch-Partenkirchen GmbH, D-82467 Garmisch-Partenkirchen, Germany. 12Genetic Health Services Victoria, Department of Genetics, Royal Children's Hospital, Melbourne, Australia. 13Nuffield Department of Orthopaedic Surgery, Nuffield Orthopaedic Centre, Windmill Road, Headington, Oxford OX3 7LD, UK. 14Institute of Musculoskeletal Sciences, Botnar Research Centre, Nuffield Orthopaedic Centre, University of Oxford, Oxford OX3 7LD, UK. 15Assistance Publique - Hôpitaux de Paris (AP-HP), Hôpital Marin, 64700 Hendaye, France. 16Department of Surgery and 17Department of Pediatrics, Georgetown University School of Medicine, Washington, DC 20057, USA. 18Centre for Immunology and Cancer Research, Princess Alexandra Hospital, Ipswich Road, Woolloongabba, Queensland 4102, Australia. 19Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA.