- Germline mutations of the gene encoding bone morphogenetic protein receptor 1A in juvenile polyposis. Howe, J.R., Bair, J.L., Sayed, M.G., Anderson, M.E., Mitros, F.A., Petersen, G.M., Velculescu, V.E., Traverso, G., Vogelstein, B. Nat. Genet. (2001)