ased ▁cells , ▁like ▁those ▁in ▁a ▁tum or , ▁is ▁also ▁important , ▁since ▁they ▁will ▁often ▁have ▁a ▁very ▁different ▁cycle ▁than ▁health y ▁cells . ▁Single - cell ▁analysis ▁of ▁characteristics ▁of ▁the ▁cell ▁cycle ▁allow ▁scient ists ▁to ▁understand ▁these ▁properties ▁in ▁greater ▁detail . ▁ ▁Vari ability ▁in ▁cell ▁cycle ▁can ▁be ▁studied ▁using ▁several ▁of ▁the ▁methods ▁previously ▁described . ▁For ▁example , ▁cells ▁in ▁G 2 ▁will ▁be ▁quite ▁large ▁in ▁size ▁( as ▁they ▁are ▁a ▁just ▁at ▁the ▁point ▁where ▁they ▁are ▁about ▁to ▁divide ▁in ▁two ), ▁and ▁can ▁be ▁identified ▁using ▁protocol s ▁for ▁cell ▁size ▁and ▁shape . ▁C ells ▁in ▁S ▁phase ▁copy ▁their ▁genom es , ▁and ▁could ▁be ▁identified ▁using ▁protocol s ▁for ▁st aining ▁DNA ▁and ▁meas uring ▁its ▁content ▁by ▁flow ▁c yt ometry ▁or ▁quant itative ▁flu ores c ence ▁micro sc opy , ▁or ▁by ▁using ▁prob es ▁for ▁gen es ▁expressed ▁highly ▁at ▁specific ▁phases ▁of ▁the ▁cell ▁cycle . ▁ ▁References ▁▁ ▁Category : Cell ▁bi ology <0x0A> </s> ▁Thomas ▁Allen ▁( or ▁Alle yn ) ▁( 2 1 ▁December ▁ 1 5 4 2 3 0 ▁September ▁ 1 6 3 2 ) ▁was ▁an ▁English ▁math ematic ian ▁and ▁ast ro lo ger . ▁High ly ▁re put ed ▁in ▁his ▁lifetime , ▁he ▁published ▁little , ▁but ▁was ▁an ▁active ▁private ▁teacher ▁of ▁mathematics . ▁He ▁was ▁also ▁well ▁connected ▁in ▁the ▁English ▁intellectual ▁networks ▁of ▁the ▁period .