21.   Other experts, at New York Medical College, just reported compelling evidence that human hearts can grow new cells.

22.   Others, at New York Medical College, just reported compelling evidence that human hearts can grow new cells.

23.   Reprogenesis Inc., a private firm in Massachusetts, is in late-stage trials of two techniques to grow cells to fix leaky bladders.

24.   Scientists would like to grow cells in the laboratory, add or delete genes, and then select cells that have been appropriately modified.

25.   Scientists would grow pig cells in a laboratory and add genes that would make their surface proteins identical to proteins that coat human cells.

26.   Still other scientists are trying to find ways to grow pancreatic cells in culture to provide transplants.

27.   Tests in animals show that when the cells are grown on ceramic and put into bone, they turn into bone-forming cells.

28.   The ability to grow normal cells indefinitely would be a boon to biologists and vaccine makers.

29.   The cells were grown in the laboratory and then returned to the mouse, where the normal gene could go to work.

30.   The idea would be to grow pig cells in the laboratory, add human genes and then clone those cells that best expressed the genes.