○, Estimates of logarithmic mutation rate (lnνi) up to an additive constant C, for microsatellite loci, grouped by their repeat motif types (di-, tri-, and tetranucleotides): (a) data from refs. 16–18, (b) data from ref. 20, and (c) data from GDB. The vertical bars represent the ±1 SD intervals. •, Estimates for disease-causing trinucleotides within the normal range of allele sizes.