Chunk #4 — Sample

Source: Evidence for multiple genetic factors underlying the DSM-IV criteria for alcohol dependence.
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We used in these analyses data from 7548 twins, including both members of 3089 pairs (503 mono-zygotic (MZ) FF, 330 dizygotic (DZ) FF, 707 MZ MM, 491 DZ MM, and 1058 opposite sex DZ pairs) and 1395 twins without their co-twin. (These numbers do not exactly sum because we counted all possible pairs in our triplets and quadruplets).