1.   But in rare cases a virulent strain of N. meningitidis manages to penetrate mucosal cells in our respiratory tract.

2.   Cerus uses a different chemical for red blood cells because light cannot penetrate these cells to activate a psoralen.

3.   Certain aggressive viruses, such as West Nile, can penetrate brain cells and wreak havoc.

4.   Karen Wooley, the chemist who created them, has shown that her knedels can penetrate living cells when attached to a protein that acts as a key.

5.   No one knew whether oligos would penetrate cells, and once inside, what part of the mRNA they should bind with.

6.   Once the virus penetrates a cell, that cell should start producing the chemical needed for blood clotting, helping the hemophiliac.

7.   The hollow virus was an effective delivery vehicle, however, because it retained its ability to attach to and penetrate mammal cells.

8.   The work also debunked a theory that the virus was so vicious because it possessed a unique genetic structure that allowed it to penetrate cells more easily.

9.   The new approach appears to work because the synthetic genetic material is able to penetrate cells but is not immediately broken down by the body.

10.   The study suggests pneumococcus can use the structure to penetrate cells and reach the bloodstream, opening the door to sepsis and meningitis.