The company says the original handwritten recipe is housed in a 770-pound safe encased in two feet of concrete and guarded by video cameras and motion detectors.
The company is initially concentrating on biofilms that Lu says can corrode water pipes and block heat transfer in heating and cooling systems, decreasing energy efficiency by up to 80 percent.
While the original aim was to raise the hull if at all feasible, the operation was not given the go-ahead until January 1982, when all the necessary information was available.
Initial trials of PLX4032 suggest it may be as good as, or even better than, ipilimumab at improving sufferers' survival. A full-scale, double-blind trial is now under way.