Protein concentrations were determined using bicinchoninic acid (BCA) assay kit (Thermo Scientific, MA, USA) with bovine serum albumin standard. Samples (30 μg protein per lane) were separated in SDS-polyacrylamide gels and transferred electrophoretically to Immobilon-PSQ transfer membranes (Millipore), as reported previously57 (link). Band intensities were measured using FluorChemTM SP software (Alpha. Innotech, San Leandro, CA, USA) and normalized to β-actin or total Akt.
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