The United States Food and Drug Administration released a modified set of guidelines for blood donors on Thursday.
Israel's Ministry of Health is allowing the new system on a two-year trial basis.
Lance Bass would like to donate blood to help Vegas victims, but he can't.
Rules banning homosexual and bisexual men from donating blood were enforced in the 80s.
Gay men can now donate blood 12 months after their last sexual contact with another man.
Making red blood cells from scratch, locating aging genes and "designer" cells help cure leukemia.
The risk for HIV transmission through blood transfusion is incredibly small.
The model could help treat platelet function disorders.