U.S. scientists have developed
a strain of green-glowing cats with cells that resist infection
from a virus that causes feline AIDS, a finding that may help
prevent the disease in cats and advance AIDS research in
people.

The study, published Sunday in the journal Nature
Methods, involved inserting monkey genes that block the virus
into feline eggs, or oocytes, before they are fertilized.

The scientists also inserted jellyfish genes that make the
modified cells glow an eerie green color -- making the altered
genes easy to spot.

Tests on cells taken from the cats show they are resistant
to feline immunodeficiency virus, or FIV, which causes AIDS in
cats.

``This provides the unprecedented capability to study the
effects of giving AIDS-protection genes into an AIDS-vulnerable
animal,'' Dr. Eric Poeschla of the Mayo Clinic in Rochester,
Minnesota, who led the study, said in a telephone interview.

Poeschla said that besides people, cats and to some extent,