Western blot shows lysates of HUVEC human umbilical vein endothelial cells, MCF‑7 human breast cancer cell line, and human skeletal muscle tissue. PVDF membrane was probed with 1 µg/mL of Sheep Anti-Human ATG4A Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4324) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for ATG4A at approximately 48 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.