(Ely, MN)  --  Authorities say a research bear has been shot and killed in northeast Minnesota. Officials at the North American Bear Center in Ely say a young bear wearing a radio collar and pink ribbons was killed this week.  They picked up her blood-spotted collar from the DNR Tuesday after it was turned in anonymously.  It's not illegal for hunters to take collared bears, but the DNR has asked them not to.  Officials say the other radio-collared bears in the region appear to be safe.