the growth capacity of femoral bone marrow stem cells from young and old long-lived mice was assessed in the spleen of x-irradiated young and old syngeneic recpients by determining : ( a ) the number of stem cells colonizing the spleen , ( b ) the rate of incorporation of 125i-labeled iododeoxyuridine by proliferating colony cells , and ( c ) the number of cells present in the largest colonies at the end of the growth phase.we found that the growth capacity of stem cells declined with age .
C0007634
cells
C0007595
growth