Western blots showed that ZNF804A immunoreactivity is present in adult and fetal brain (Figure 4A and eFigure 3 in the Supplement). A single band was identified at approximately 140 kDa, similar to that observed in ZNF804A-transfected cells and bacteria9 and corresponding to the predicted molecular weight of 137 kDa. Signal was abolished by the blocking peptide, and the P-13 mouse antibody produced the same banding pattern (eFigure 4 in the Supplement).