11.   But these cells would grow only briefly in laboratory cultures.

12.   But, Nottebohm said, the problem might be that scar tissue is interfering with the reconnection of circuits in the brain, not that new cells cannot grow.

13.   Her work with the zebra fish may hold the answer to fundamental questions about how cells grow - and biotechnology firms are standing in line to reap the profits.

14.   If not removed early, cancer cells may grow downward from the skin surface, invading healthy tissue.

15.   If the cells grow as they would in a developing pig, they could create a new connection in his spine.

16.   I may have to stop taking thalidomide if these and other effects become intolerable, or if the tumor cells grow resistant to the drug.

17.   If the transfer is successful, the cell grows into an embryo and eventually into a replica of the DNA donor animal.

18.   In psoriasis, skin cells grow too fast and pile up in thick patches that itch, burn, crack and bleed.

19.   In some patients, the fetal cells apparently grew too well.

20.   Normal adult cells cannot grow and divide indefinitely in a test tube.