Online retrieval of multiple SNP input for LD measurement, prediction, and visualization. (A) Three LD functions are available in LD2SNPing: 1) user-defined files, 2) sample files, and 3) multiple SNPs. The input steps for multiple SNPs are demonstrated by arrows #1 to #8. Four SNPs, rs11571315, rs733618, rs5742909, and rs11571316, are used as examples. All the ssID#s with HapMap-CEU are selected. All selected SNP genotypes are provided after manually clicking the "Find" box. Similar results are shown in Figures 3 and 4. (B) Multiple choices for LD analysis of single rsID# SNP. In the example, rs2078486, six ssID#s are available. Each ssID# possesses different SNP data sets as indicated by numbers 1 to 6. The data is retrieved from NCBI and HapMap.