
HY500011 by Applied Biological Materials (ABM) is a mouse monoclonal antibody (clone IHC441, IgG1 kappa) targeting PD-L1 (CD274/B7-H1), validated for IHC at 1:50–1:200 and ELISA. It detects PD-L1 expression in tumor cells and immune cells in the tumor microenvironment across solid tumor types. MBP is a registered vendor for Howard Hughes Medical Institute, Vanderbilt University, and MD Anderson Cancer Center.