The replication genotyping experiment performed by CIDR was done using the Illumina BeadLab system. The BeadLab system incorporates automation of all DNA and liquid handling steps. The included LIMS incorporates Illumina's protocols as well as tracking and enforcing workflow. Standard Illumina protocols and reagents were used. Data analysis was performed at CIDR using Illumina's Gentrain and GTS Reports software. The cluster definitions were defined independently on the replicate data set.