1.   Foreign genes introduced into crops pollinated by insects may quickly spread to related wild varieties, US biologists have concluded.

2.   Recent advances in gene manipulation have made it possible to express foreign genes in heterologous systems.

3.   Among other more pressing concerns are whether genetically modified crops can create problematic weeds by passing their foreign genes on to wild relatives.

4.   And would wines made from the grapes containing foreign genes retain their varietal purity?

5.   And would wines made from grapes containing foreign genes retain their varietal purity?

6.   As a further safeguard, this enzyme comes from a second foreign gene that Oliver has inserted.

7.   Because of increasing concerns about genetically engineered plants and their pollen, which contains foreign genes, researchers say the new studies are particularly interesting.

8.   Before any experiment in which a foreign gene is inserted in a human being receives NIH support, it must be approved by the RAC.

9.   A major concern is that foreign genes from these plants could escape into wild plants by interbreeding.

10.   About half the soybeans and one-third of the corn grown in the United States last year contained foreign genes making the crops resistant to herbicides or insects.