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Figure 1. GSK-3β and GSK-3α in the aged heart. (A) Immunoblots of phospho(S9)-GSK-3β, GSK-3β, phospho(S21)-GSK-3α, GSK-3α, β-catenin, myeloid cell leukemia 1 (Mcl-1), and tubulin in left ventricular homogenates from WT and homozygous GSK-3βS9A knock-in mice (βKI) at 6 and 24 months (M) of age. The results of two experiments (out of four) are shown. (B) Relative band density of