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1a. Background
1b.
Specific aims
- 494
Affected Concordant DZ Pairs (incl. opp-sex), =>both twins, parents,
& additional affected siblings
- 228
Extreme Discordant DZ Pairs (same sex only), =>both twins, parents,
& additional affected siblings
- 194
Severely Affected Concordant MZ Pairs. =>at least one twin, parents,
& additional affected siblings
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