The amount of Cα associated with RIα in the presence or absence of SPATC1LΔC. After IP of RIα in cells overexpressing SPATC1LΔC or control, immunoblot analysis was performed using anti-Cα antibody. Graph shows densitometric analysis of Cα in relation to immunoprecipitated RIα in immunoblot analysis . In, input; IgG, immunoglobulin G from normal rabbit serum. 