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Pedigree of a colony formed from a cell irradiated with 2.5 Gy.
Each horizontal line represents the life of a cell, relative to the time of irradiation.
Black: cells which continue to divide (clonogenic survivors)
Red /
orange
: cells that die (apoptose) - but often after several divisions!
Modes of cell
death as
analyzed in
pedigree of
irradiated cells