Flow Contract Site Laboratory (FCSL) is a contract research organization that delivers pre-clinical and clinical flow cytometry services. It provides antibody panels for immunophenotyping, receptor occupancy, intracellular cytokine and phospho-protein detection, cell cycle arrest and progression, antigen stability, and cellular functional assays. FCSL specializes in the processing of various specimen types, including whole blood, tissue, frozen PBMCs and tumors for pre-clinical model systems and human clinical trials.