Neutralization of FLRG in K562 human chronic myelogenous leukemia cell line. Samples were incubated in FLRG polyclonal antibody (Product # PA5-47106). Recombinant Mouse Follistatin-related Gene Protein/FLRG inhibits Recombinant Human/Mouse/Rat Activin A induced hemoglobin expression in the K562 human chronic myelogenous leukemia cell line in a dose-dependent manner (orange line), as measured by the psuedoperoxidase assay. Inhibition of Recombinant Human/Mouse/Rat Activin A (7.5 ng/mL) activity elicited by Recombinant Mouse Follistatin-related Gene Protein/FLRG (0.1 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Mouse Follistatin-related Gene Protein/FLRG Antigen Affinity-purified Polyclonal Antibody. The ND50 is typically 3‚12 µg/mL.