title: Update and Review: Supernumerary Marker Chromosomes.
abstract: Supernumerary marker chromosomes (SMCs) are found in individuals with normal and abnormal clinical phenotypes. Correlations between karyotype and phenotype have been made in only a few circumstances. This article summarizes the most recent information regarding supernumerary marker chromosomes, including genetic counseling issues.
authors.affiliation: Genetics Department, Kaiser Permanente, 260 International Circle, San Jose, CA, 95119, sharon.ungerleider@kp.org.
authors.forename: S
authors.initials: S
authors.lastname: Ungerleider