1.   Divide bearded irises, cutting away any diseased parts of the rhizomes before replanting.

2.   I hack off all the diseased parts, and perhaps it will spring back to life from the sparse sprouts that remain.

3.   The goal is to grow replacements for diseased parts of the body for which transplants or manufactured substitutes are unavailable or rare.

4.   The hope was that new, young cells injected into a diseased part of the body would generate healthy tissue.

5.   There have been fears that people who eat diseased animal parts could come down with a human version of BSE, which ravages the brain and eventually kills.