a differential giemsa staining between sister chromatids was obtained by treating chromosomes replicated twice in medium containing 5-bromodeoxyuridine ( brdu ) with hoechst 33258 plus black light at 55 degrees c ( hb pretreatment ) and deoxyribonuclease ( dnase ) i , ii , or micrococcal nuclease .
C1519334
sister chromatids
C0008633
chromosomes