Table 1.

Samples Used for Affected Sib Pair Linkage Analysis

	No. of
	Families
FamilyStructure	SAHPositive	SAHNegative	Total	Individuals	Sib Pairs
Pairs	68	9	77	154	77
Trios	4	3	7	21	21
Quartets	1	0	1	4	6
Total	73	12	85	179	104