title: A familial bisatellited extra metacentric microchromosome in man.
abstract: A bisatellited, extra metacentric microchromosome was found in a normal male and his father. This extra marker participated in satellite association in over 50 percent of the cells; silver-staining revealed only one active NOR region. Other banding studies identified two other cytogenetic "markers" in the family-a 9qh+ and a 21s+. Risk for a carrier of such a microchromosome is probably low but cytogenetic amniocentesis is recommended to rule out aneuploidy in the fetus.
mesh_terms: D002466:Cell Nucleolus; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D005819:Genetic Markers; D006801:Humans; D007621:Karyotyping; D008297:Male; D010375:Pedigree
chemical_list: D005819:Genetic Markers