11.   Anti-sense drugs work by blocking selected genes from producing disease-causing proteins.

12.   Antisense drugs work by blocking selected genes from producing disease-causing proteins.

13.   Anti-sense drugs work by disabling a single-stranded messenger, RNA, also known as the sense strand.

14.   Antiviral drugs have worked wonders for individual patients, but they will never contain the epidemic.

15.   Ask how to know if the drug is working.

16.   Before then, Bukstein often used sample-sized medications to see if a drug would work for a patient before writing a prescription.

17.   Biotechnology stocks often rise as tests show their drugs are working.

18.   Both drugs work by interrupting a key step in the life cycle of HIV.

19.   A spokesman for Pfizer said that companies did not often provide samples of generic drugs because physicians already understand how the older drugs work.