Recombinant Human CNTF R alpha (Catalog # 303‑CR) enhances Recombinant Human CNTF (Catalog # 257-NT) induced proliferation in the TF‑1 human erythroleukemic cell line in a dose-dependent manner (orange line). Enhancement of Recombinant Human CNTF (20 ng/mL) activity elicited by Recombinant Human CNTF R alpha (1 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human CNTF R alpha Antigen Affinity-purified Polyclonal Antibody (Catalog # AF‑303‑NA). The ND50 is typically 10‑20 µg/mL.