Map of the AMN gene locus in chromosome band 14q32. Eighteen microsatellite markers flanking AMN from 2.3 Mb centromeric to 1.2 Mb telomeric are shown above the upper line. Eleven single nucleotide polymorphisms between AMNM6 and AMNM7 and centering on the AMN gene locus are shown in the enlarged region below. The AMN gene is depicted as a black rectangle and the mutation is underlined. All 29 marker loci were used for genotyping and age calculations (see text). Physical distances are not drawn to scale.