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I've heard different answers about the ability of brain cells and other nerve cells to divide and replace them selves. Bone growth stops in your teens and 20s. Bone remodeling is on going, but one anatomy book says at least part of the long bones like the femur may not be completely replaced in a lifetime. Heart muscle tissue is not replaced after maturity. I dont think other muscle tissue is either - it gets bigger by increasing the number of actin and myosin fibres inside cells. (When it is damaged, its replaced by scar tissue.) And teeth, as mentioned are original parts. Eggs in females.