Figure 4.
Microsomal calcium uptake experiments. Calcium uptake was initiated with MgATP (arrow), in a system containing cell microsomes (C34-derived, black circles or E47-derived, white circles), an ATP regenerating system (phosphocreatine/creatine kinase) and fluo3 (membrane impermeable). The reaction was followed in a microplate reader with appropriate fluorescence filters under constant shaking.