in drosophila melanogaster cell lines and larval neuroblast cells , two aspects of the phenomenon of sister chromatid exchanges were analyzed : ( 1 ) the frequency of sces in relation to the ploidy level ( comparing diploid and tetraploid cells ) and in relation to the cell type ( comparing embryonic and larval cells ) ( 2 ) the localization of the sites of exchange with reference to eu- and heterochromatin .
C0037211
sister chromatid exchanges
C0007634
cells