Hi, I am interested in your ELISA kits for measuring RANKL in various samples. Can you please tell me what the difference is between these two kits: E0855h Human receptor activator of nuclear factor kappa B ligand ELISA Kit E0470h Human soluble receptor activator of nuclear factor-kB ligand ELISA Kit Is there a specific reason to choose one of these kits rather than the other? Once I have this information I will place an order with your distributor in Australia. Thanks,