There have been many discussions on longevity from ancient times to the present day. In the
Laozi, it is said,“Heaven and earth are long and enduring because they do not arise from …

As human life expectancy continues to increase and the birth rate continues to decline, the
phenomenon of aging is becoming more prominent worldwide. Therefore, addressing the …

In humans, aging is ineluctable as well as inexorable. That is really mysterious, because
from a biological viewpoint there is no reason why aging should happen. Aging is stranger …

Bone marrow is a soft, gelatinous, and dynamic tissue present in the central cavity of long
bones such as the femora and humeri. Bone marrow is a large reservoir of pluripotent stem …

Background: The increasing demand for health care services, the extraordinary results
obtained by applying innovative biotechnology, and the intense debate aroused by the …

The percentage of elderly people in the world is increasing at an unprecedented pace; so it
is in China, which has the world's largest population and a high ratio of the seniors (aged 60 …

Stem cells are one kind of cells that have the potential of proliferation and differentiation. The
human beings are originated from a totipotential stem cell—fertilized egg. After birth, the …

Biology of aging is an active and rapidly expanding area of biomedical research. Over the
years, focus of work in this field has been gradually shifting from studying the effects and …

Senescence is a biological process that causes a progressive deterioration of structure and
function of all organs chronologically. Recent studies have revealed the detailed molecular …

Since life emerged in cellular form, two things must have become imminent, the cell must
propagate itself and there should be a limited lifespan of a cell. If cells do not die, new cells …