Los Angeles ? Collagen to plump up starlets’ lips. New knees to enable weekend athletes to play basketball again. Skin for burn victims. Cadavers for surgeons to practice on.

A corpse-selling scandal at UCLA has underlined a squeamish fact for people thinking of leaving their remains to science: Bodies are big money.

And not only that, but some aspects of the industry are virtually unregulated.

“It’s a wild, wild West out there in tissue land, with few sheriffs and a lot of shady characters meeting in the back rooms,” said Dr. Art Caplan, a professor of bioethics at the University of Pennsylvania.

On Tuesday, the University of California at Los Angeles, which receives an average of 175 donated corpses a year, agreed to a court order to stop accepting such cadavers until an investigation is completed into allegations that two men, including the director of the university’s Willed Body Program, sold body parts on the side for their own profit.

Director Henry Reid and Ernest V. Nelson, who is not a UCLA employee, were arrested over the weekend. The Los Angeles Times reported that it was shown invoices on a UCLA letterhead indicating 496 cadavers were sold for a total of $704,600 between 1998 and 2003. One client was pharmaceutical giant Johnson & Johnson.

The company said a subsidiary called Mitek obtained tissue from Nelson in the 1990s, but added, “Mitek did not knowingly receive samples that may have been obtained in an inappropriate way.”

“We take the matter of using human tissue samples for medical research and education very seriously. We are sensitive to the need that all samples are appropriately and properly obtained, stored and shipped,” Johnson & Johnson said in a statement.

Donated cadavers and the corneas, tendons, skin and other parts taken from them are in high demand for transplants, medical training and research by universities and companies. Experts say the U.S. human tissue industry is worth hundreds of millions of dollars a year.

Demand always outstrips supply. Each year, about 20,000 bodies are donated and about 1 million transplants involving human tissue are performed, said Bob Rigney, chief executive of the American Association of Tissue Banks, which has 83 members banks.

Tendons and ligaments are used to treat sports injuries, long bones to replace those eaten away by cancer, shaped bone products for spinal surgery, ground bone in dental surgery. Cadavers supply corneas and heart valves; help medical students learn anatomy; give surgeons practice in cutting, stitching and other operating techniques; and have even served as crash-test dummies. Cadaver collagen finds its way into people’s lips.

Heart valves can fetch $5,000 to $7,000 each. Skin, used to dress the wounds of burn victims, can go for $1,000 a square foot. Brains, veins, fingernails — pretty much every part of a corpse can be valuable.

If a single body could provide all its organs, the cadaver would be worth $150,000, Caplan said.