Chunk #2 — Introduction

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Genome-wide association study in obsessive-compulsive disorder: results from the OCGAS.

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Two genetic linkage studies of OCD have found a suggestive linkage peak on chromosomal region 9p24 7, 8. The OCD Collaborative Genetics Study (OCGS) also found suggestive genetic linkage peaks on chromosomal regions 3q27-28, 6q, 7p, 1q, and 15q, but none were genome-wide significant 9.