▁flu ores cent ▁signal ▁of ▁P I ▁can ▁be ▁used ▁to ▁quant ify ▁DNA ▁content ▁for ▁cell ▁cycle ▁analysis ▁or ▁to ▁identify ▁dead ▁cells ▁in ▁a ▁sample . ▁ ▁C ertain ▁flu ores cent ▁d yes ▁can ▁be ▁used ▁to ▁character ize ▁kin etic ▁int rac ell ular ▁activity ▁rather ▁than ▁fixing ▁cells ▁in ▁formal de hy de ▁and ▁losing ▁vi able ▁cells . ▁The ▁table ▁below ▁out lines ▁d yes ▁that ▁can ▁be ▁used ▁to ▁measure ▁several ▁parameters ▁of ▁c yt ot ox icity ▁caused ▁by ▁ox id ative ▁stress . ▁ ▁This ▁experimental ▁setup ▁is ▁just ▁one ▁example ▁of ▁the ▁cap ability ▁of ▁flow ▁c yt ometry . ▁In ▁F AC S ▁systems , ▁these ▁character ized ▁cells ▁can ▁then ▁be ▁sorted ▁and ▁pur ified ▁for ▁further ▁experiments . ▁ ▁Mag net ic ▁activ ated ▁▁ ▁Mag net ic - activ ated ▁cell ▁sorting ▁( MA CS ) ▁provides ▁a ▁method ▁for ▁en rich ing ▁a ▁heter ogeneous ▁mixture ▁of ▁cells ▁based ▁upon ▁ext rac ell ular ▁properties , ▁typically ▁cell - sur face ▁prote ins ▁( ant ig ens ). This ▁is ▁a ▁column ▁based ▁separation ▁technique ▁where ▁l abeled ▁cells ▁are ▁passed ▁through ▁a ▁magnetic ▁column . ▁Mag net ic ▁be ads , ▁called ▁micro be ads , ▁are ▁pa ired ▁with ▁a ▁group ▁of ▁cells , ▁then ▁either ▁placed ▁within ▁a ▁magnet ▁or ▁exposed ▁to ▁a ▁magnetic ▁field ▁after ▁being ▁inc ub ated ▁or ▁sh aken ▁in ▁a ▁buffer ing ▁solution . ▁The ▁cells ▁pa ired ▁with ▁the