Recombinant Rat CNTF R alpha (Catalog # 558-CR) enhances Recombinant Rat CNTF (Catalog # 557-NT) induced proliferation in the TF‑1 human erythroleukemic cell line in a dose-dependent manner (orange line). Enhancement of Recombinant Rat CNTF (10 ng/mL) activity elicited by Recombinant Rat CNTF R alpha (0.25 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Rat CNTF R alpha Antigen Affinity-purified Polyclonal Antibody (Catalog # AF‑559‑NA). The ND50 is typically 2‑6 µg/mL.