I am working with drug activity on familial ALS model cells. I am using mouse Neural stem cells which express the mutated human SOD1 protein. I did western blot with the protein extracted from the cells. I used SOD1 goat polyclonal antibody raised against a peptide mapping at the C-terminus of SOD1 of human origin. The antibody manufacturer recommends it for the detection of SOD1 of mouse, rat and human origin. But when I did western blot I got a band for the mutated human protein but I didn't get any band for the native mouse protein. Can anybody help me with this?