our analysis also proved helpful in difficult karyotyping situations : ( a ) identifying the donor chromosome fragment as chromosome 18 band q21 in 4 of 9 ( 44 % ) cases that cytogenetically displayed a 14q+ chromosome of unknown origin , and ( b ) identifying a rearrangement of chromosome 18 band q21 in 12 of 18 ( 67 % ) cases that cytogenetically yielded no cells in metaphase .
C0007634
cells
C0025564
metaphase