"Genetic analysis of ACVR1 identified the recurrent allelic variant c.617 G>A; p.R206H in 12 of 14 Fibrodysplasia Ossificans Progressiva (FOP)patients. One of the remaining patients had a previously reported allele c.1067G>A; p.G356D in the 9th exon and the second allele c.983G>A; p.G328E in the 8th exon of ACVR1."xsd:string