title: Letter: A1 and C9 marker chromosomes in children with combined minor and major malformations.
mesh_terms: D000015:Abnormalities, Multiple / Q000175:diagnosis / Q000235:genetics*; D002648:Child; D002869:Chromosome Aberrations / Q000175:diagnosis / Q000235:genetics*; D025063:Chromosome Disorders; D005260:Female; D006570:Heterochromatin / Q000032:analysis; D006801:Humans; D007621:Karyotyping; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis
chemical_list: D006570:Heterochromatin