21.   Still, researchers emphasized that they simply do not know what will happen to those whose valves were damaged by the diet drugs.

22.   All researchers emphasized that years of further research and development would be needed before human clinical applications could take place.

23.   The researchers emphasized that the HIV virus could be an ideal vector because it is a retrovirus.

24.   Researchers emphasized however that acetaminophen, one of the most widely used medications for minor illness and pain, is also one of the safest when taken properly.

25.   Researchers emphasize that they believe infections will add to a mix of known factors causing mental illness rather than replace faulty genes and life experience as a primary cause.