MLL1 Antibody Host:Rabbit Antibody Type:Polyclonal Species Reactivity:Human, mouse Application:Western blot Western blotting (1:500 – 1:2000). However, the optimal concentrations should be determined individually. K562 nuclear extract can be used as a positive control. The antibody recognizes the MLL1 of human and mouse origins. Reactivity to other species has not been tested.