we found that biological aging seems to regulate certain predictable changes during the first part of the lifespan : the disappearance postnatally of dihydroxylysinonorleucine in skin , the rapid decrease in difunctional crosslink content in lung and skin during early growth and development , and the gradual rise in hydroxypyridinium and lysyl pyridinium in lung tissue .
C0024109
lung
C0819757
lung tissue