In an attempt to replicate these findings, Willour et al138 genotyped microsatellite markers on all available relatives in 50 pedigrees which had been ascertained through persons with OCD. The largest LOD scores observed in this study were for markers D9S1792 (HLOD=2.26) D9S1813 (NPL=2.52, P=0.006). D9S1813 and D9S1792 are within 350 kb of marker D9S288, the marker yielding the largest LOD score reported by Hanna et al.
