four marker chromosomes were present in most metaphases : a der ( 1 ) which resulted in tetrasomy for most of 1q , a giant chromosome consisting of most of a chromosome 2 and 4q , a small metacentric which was probably an isochromosome for 4p or 5p , and a small chromosome , considered to be an 18q+ .
C1327882
1q
C0008633
chromosome