But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.08.12

Doctor Ruhli says researchers used this method to study changes in the tuberculosis bacteria from two thousand year-old mummified tissue.

VOA: special.2010.06.29

Four of the five marmosets born as part of the experiment carried the foreign gene in several kinds of tissue.

VOA: special.2009.06.23

The deformed cells block blood vessels and cut off the flow of oxygen to tissue in the body.

VOA: special.2009.12.16

The scientists found the strongest evidence of AIDS in studies of tissue from the chimps that died.

VOA: special.2009.09.08

Stem cells from very early embryos are able to grow into any tissue in the body.

VOA: special.2009.04.07

In the process, a small piece of tissue is taken from a high quality orchid.

VOA: special.2010.04.06

The fifth only carried the green protein in its placenta tissue at birth.

VOA: special.2009.06.23

These problems were more common among males, those with injured nerve tissue in the brain and those who had been given oxygen supplies for days as a baby.

VOA: special.2010.11.30

The tissue is made into tiny pieces and grown in a laboratory.

VOA: special.2010.04.06

Some drugs reduce the swelling in nerve tissue.

VOA: special.2009.01.06

Food production increased. Now,rinderpest expert John Anderson calls the end of the disease "the biggest achievement in veterinary history" Officials say they must still decide where to keep some of the virus and infected tissue for future research.

VOA: special.2010.11.02

Access to a Caesarean section to relieve the pressure of obstructed labor is the most common way of preventing an unborn child from pressing so tightly in the birth canal that it cuts off blood flow to surrounding tissue.

VOA: standard.2009.12.23