Fetal tissue grows faster than adult tissue, is more adaptable and is rejected less by the immune system.

In adult somatic tissues, cytosine residues may be methylated, and this occurs almost exclusively within a symmetric CpG context.

It is also more highly expressed in fetal tissues than adult tissues.

It grows faster than adult tissue, and it is less likely to be rejected by the immune system.

It is nonetheless active to some degree in many adult tissues of the mouse, whereas the same tissues in humans have no detectable telomerase.

Implanted fetal tissue grows rapidly and is less likely than adult tissue to be expelled by the body's immune system.

Since fetal tissue grows as much as four times faster than adult tissue, it only takes a month to grow enough tissue for use in most surgeries.

In all vertebrates, these are the forerunners of all adult tissues and organs.

In cardiology neocardiogenesis is the homeostatic regeneration, repair and renewal of sections of malfunctioning adult cardiovascular tissue.

Discussion Although domoic acid's excitotoxicity to adult neuronal tissue in humans, rats, mice and monkeys is well documented (for review see Ref.