LD50 -LRB- `` lethal dose NUMBER@1 % '' -RRB- uses about NUMBER@2 to NUMBER@3 animals to find a dose killing NUMBER@1 % of animals within a given time .

LD50 -LRB- `` lethal dose NUMBER@1 % '' -RRB- uses NUMBER@4 animals to find a dose that kills NUMBER@1 % of animals in a given time .
