We describe two polymorphic microsatellites in intron 27 of the neurofibromatosis type 1 (NF1) gene. The microsatellites consist of TG/AC and AC/TG dinucleotide repeats detecting five and seven alleles and with heterozygosities of 0.46 and 0.72, respectively. These microsatellites are useful tools both for direct and indirect genetic analysis of NF1.