Questions 5-8 refer to the following passage.

Select the sentence from the passage which suggests how the use of isolated HIT molecules, if they were to be approved for general use, would be limited.

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Although multi-organ transplants have become more common, scientists and surgeons continue to face the ineluctable obstacle of time. Current Line donor organ preservation times hover around (5) five to six hours. Because of the complicated tissue-matching process, oftentimes organs are unable to reach their beneficiaries, wasting valuable, viable organs. However, scientists are hopeful that a certain substance, called the (10) Hibernation Induction Trigger (HIT), will extend the life of a potential transplant organ. HIT is an opiate-like substance found in the blood of hibernating animals. Previous experi- ments have shown that opioids act as an (15) autoperfusion block, preventing blood from flow- ing through the lymphatic system to organs, a phenomenon known as ischemia. In a preliminary experiment, an infusion of plasma with the Delta opioid delayed hemorrhaging in certain labora- (20) tory animals. When this arresting of activity was applied to the transplantation of organs, physi- cians reported preservation times up to 15 hours, a more than two-fold increase over standard conservation.