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Figure 5 SR Ca²⁺-ATPase, Ca²⁺ Uptake, and Phospholamban

(A) Representative Western blot of sarcoplasmic reticulum (SR) Ca²⁺-ATPase (top panel) and the densitometric analysis of the Western blot (bottom panel). (B) The rate of Ca²⁺ uptake. (C) Representative Western blot of Ser¹⁶-phosphorylated phospholamban (p-PLB) and total PLB (t-PLB) (top panel) and the densitometric analysis of the Western blot (bottom panel). The p-PLB values (sum of pentamer and monomer, in arbitrary units) were normalized with respect to the t-PLB values (sum of pentamer and monomer, in arbitrary units). Data are presented as means ± SD. Abbreviations as in Figure 3.