apo-[aequorin]--coelenterazine + O2 <=> [aequorin]
apo-[aequorin]--coelenterazine + o2 <=> [aequorin]
apo-[aequorin]--coelenterazine + O2 <=> [aequorin]
apo-[aequorin]--coelenterazine + o2 <=> [aequorin]