ab7318 staining Spermidine in rat lungs by Immunohistochemistry (Formalin/ PFA fixed paraffin-embedded tissue sections). Tissue underwent fixation in 4% paraformaldehyde overnight and embedded in paraffin, heat mediate antigen retrieval was performed in target retrieval solution and sections were immersed in 3% hydrogen peroxide for 5 min to deplete the endogenous peroxidase activity. Sections were incubated in 1% bovine serum albumin in PBS for 30 min followed by primary antibody at room temperature for 2 h. A primary antibody Enhancer and HRP polymer were used according to the manufacturer's instructions. Left image show staining with ab7318 while the right one show staining with same procedure without primary antibody.