1.   So Potrykus used genetic manipulation to insert genes from the daffodil that encode the biological machinery for production of beta carotene.

2.   Which is what inspired Smith and his colleagues to try to insert the gene for HbsAg into vaccinia.

3.   In the genetically engineered strain, an extra gene has been inserted.

4.   A human gene can be inserted into fibroblasts using a retroviral vector, and the skin then grafted back to the donor.

5.   Amgen inserts the gene for making Epogen into Chinese hamster ovary cells, which then make the protein.

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

7.   A vector is the disabled virus used by gene therapists to insert corrective genes into human cells.

8.   Agracetus contends that it deserves a broad patent for having been the first to perfect the technique of successfully inserting foreign genes into cotton and soybean cells.

9.   But inserting genes into human cells in full working order has proved to be exasperatingly difficult.