the kinetic parameters of atpase-2 and the similarity of the apparent mr of its phosphoenzyme intermediate to that of skeletal-muscle sarcolemma ca2+-mg2+-atpase makes it likely that the calmodulin-sensitive ca2+-mg2+-atpase found in rat liver microsomal fractions reflects a contamination with plasma membranes ( possibly from non-parenchymal cells ) rather than a true location in the endoplasmic reticulum of parenchymal liver cells .
C0242692
skeletal-muscle
C0036208
sarcolemma