1.   Scientists claim to have identified natural substances with cancer-combating properties.

2.   ...a natural substance that encourages cell growth.

3.   And private drug companies are reluctant to spend research dollars on a natural substance that will carry no patent royalties.

4.   And now it appears that this nontoxic natural substance may be even more valuable as an abundant, environmentally sound cleaner and stabilizer.

5.   As a result, it is forbidden under IOC drug guidelines, even if it enables the body to create more of a natural substance.

6.   Because leeks contain a natural gelatinlike substance, the filling holds together beautifully, whether served hot, warm or at room temperature.

7.   Because andro is a natural substance produced by the body, the FDA pays it no mind.

8.   Both are forms of beta interferon, an artificial version of a natural substance made by the immune system.

9.   A small company in an obscure corner of Finland discovered a natural substance that could lower cholesterol levels.

10.   A successful jam depends on the proper balance between acid, sugar and pectin, a natural substance that is extracted from most fruits when they are boiled.