title: Extra G positive band on the long arm of chromosome 9.
abstract: Various heteromorphisms of the 9q heterochromatic area have been reported. In most instances, the extra G positive band is accompanied by an extra C band. We describe a family where the extra G band is totally euchromatic and does not include an extra C band. It is not clear whether these two types of variant chromosome 9 arose from a similar mechanism.
authors.affiliation: Cytogenetics Department, Singapore General Hospital.
authors.forename: L A
authors.initials: LA
authors.lastname: Knight
authors.forename: G M
authors.initials: GM
authors.lastname: Soon
authors.forename: M
authors.initials: M
authors.lastname: Tan
mesh_terms: D000328:Adult; D000649:Amniocentesis; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D002899:Chromosomes, Human, Pair 9; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D010641:Phenotype; D011247:Pregnancy