A partial linkage disequilibrium (LD) map of the human CASR (calcium-sensing receptor) gene. Rs numbers for polymorphisms in this gene are shown at the top. The triangle points to the predicted LD block. The rectangles indicate the correlation coefficient (r2) values between the different polymorphisms; the darker the color, the higher the r2 values. This figure was obtained using Haploview  with the genotype data for Caucasian samples posted at the HapMap database [20, 21].