SOWING CELLS AND GROWING ORGANS:

The field of tissue engineering is large in this endeavor, with researchers like Dr. Atala exploring a basic approach. To repair or replace parts, they seed a biodegradable scaffold with cells and insert it into the body, where the cells, if all goes smoothly, mature into functioning tissue. . . .

In the long term, the scientists hope, patients may no longer have to wait on the national transplant list “for someone to die so they can live,” as Dr. Atala puts it. Organs could be tailor-made for people.

A more immediate goal is to improve upon a multitude of smaller therapies: transplantable valves for ailing hearts, cell-and-gel preparations for crushed nerves, injections of skeletal muscle cells for urinary continence or new salivary gland tissue to rescue radiation patients from dry mouth.

“The reason this technology works: It’s not really surgery,” Dr. Atala said. “We’re just priming the pump” by putting the appropriate cells into the appropriate place and asking the body to do the rest.

Bring it on.