Karyotype of mosaicism/ k8xx著A》八x一汽一 X一一 21-trisomy cell series 3条21号染色体 【 d 、y Normal cell 2 series 2条21号染色体21-trisomy cell series Normal cell series 3条21 号染色体 2条21 号染色体 Karyotype of mosaicism 21-trisomy