Table 1.

Summary of Utah Genetic Reference Project (CEPH) Families Used for Linkage Analysis

	No. of
Trait	Spouse Pairs	Sibling Pairs	Parent-Offspring Pairs
Lymphocyte count, CD4 T cell level, CD8 T cell level, CD4:CD8 ratio	18	385	225
CD19 B cell level	17	374	211
NK cell level	7	209	119