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Western blot analysis of hCG was performed by loading the indicated amounts of purified hCG protein extracted from human urine, and 15ul of PageRuler Prestained Protein Ladder (Product ## 26619) per well onto a 4-20% Tris-HCl polyacrylamide gel. Proteins were transferred to a PVDF membrane (Product ## 88518) using the G2 Fast Blotter (Product ## 62288) and blocked with 5% Milk for at least 1 hour at room temperature. hCG was detected at ~22kD using a anti hCG antibody (Product ## MIH9822) at a concentration of 4ug/ml in blocking buffer overnight at 4C on a rocking platform, followed by an HRP-conjugated goat anti-mouse IgG (Fc) secondary antibody (Product ## 31439) at a dilution of 1:10,000 for at least 1 hour. Chemiluminescent detection was performed using SuperSignal West Dura (Product ## 34076).
