a g = 2.003 esr signal , attributed to a free radical localized in hela cell nuclei and mitochondria but absent in membranes and cytoplasm , has been studied as a function of the culture growth cycle in normal ( nrk and 3t3 ) and virus transformed ( nrk/rsv and 3t3/sv40 ) cells .
C0026237
mitochondria
C0007634
cells