ERK and FRS2alpha phosphorylation induced by FGF 23 in Klotho expressing cells. Klotho expressing HEK 293EBNA cells were serum starved for 16hr and then stimulated with mFGF 23-Fc (ab108942), and FGF-b (100ng/ml) (positive control) for 10 min, respectively. Antibodies against pFRS2alpha, pERK1/2 & total ERK1/2 were used for immunoblotting. Lane 1: Mock (non-treated) Lane 2: Klotho + ab108942 1ng/ml Lane 3: Klotho + ab108942 10ng/ml Lane 4: Klotho + ab108942 100ng/ml Lane 5: Klotho + ab108942 500ng/ml Lane 6: Klotho + ab108942 1000ng/ml Lane 7: Klotho + 100ng/ml FGF-b