21.   The target was a gene responsible for production of an enzyme needed to produce noradrenaline, which in turn is needed for the body to produce adrenaline.

22.   They genetically manipulated laboratory mice to delete the gene responsible for nitric oxide synthase, creating a colony of so-called knockout mice.

23.   Wegener has sequenced the gene responsible for vancomycin resistance in animal and human enterococci.

24.   PPL scientists plan to try to eliminate a gene responsible for incorporating in pig cells a sugar group recognized by the human immune system as foreign.

25.   PCR has also enabled the rapid identification of genes responsible for other human diseases.

26.   But she predicted that key genes responsible for creating proteins would also mutate more quickly than expected.

27.   But the new work is the first to start with families with a strong inherited predisposition to the disease and to identify the responsible gene.

28.   If the responsible gene, or genes, can be located, a simple blood test could be used to identify the most aggressive hogs.

29.   In such an approach, the responsible genes and mutations are identified.

30.   Lewis used established genetic procedures to make bacteria absorb the genes responsible for silk production in spiders.