since no dna fragmentation occurred in thymic cells , as tested by a fluorometric technique [ c. birnboim and j. j. jevac ( 1981 ) cancer res . 41 , 1889 ] , it is probable that a selective activation of poly ( adp-ribose ) polymerase may have been induced in cells that undergo differentiation and proliferation while repopulating the thymus .
C0007634
cells
C0007589
differentiation