The database holds over 2,530,000 CEPH family genotypes generated during the last 13 years for some 11,932 polymorphic markers, including more than 8,900 microsatellite markers (57% of which are highly polymorphic). The mean heterozygote frequency of the loci in V8.1 is 0.64, and the mean number of alleles per locus is 6.2, essentially reflecting the large number of microsatellites in the database.
In addition to the raw genotypes, the database provides users with linkage file formats of markers and two-point lod scores among all pairs of markers on the same chromosome (3,544,000 two-point lodscores have been computed).

The database can be efficiently browsed or the entire data can be dumped through a convenient web interface. The dump programs allow for gross downloading of data for several markers on the same chromosome  in CEPH, LINKAGE and CRIMAP formats.