definiens: , is hereby deleted in its entire ty and replaced as follows : F. shall mean the following three su bfields : i ) treatment of nerve injury of the centra l nervous system including the brain, and spinal cord ; ii ) tr eatment of nerve injury of the retina and the crani al nerves ; and iii ) treatment of the following pathologic cond itions : nerve root impingement from musculoskeletal elements, demyelinated tissue, damage to neural ele ments exiting the spinal cord and lumbosacral regio n of spinal cord by administering a Licensed Product to the peripheral nerves in the intraspinal location, foraminal and extraspinal areas, extrapyramidal reg ions, areas of peripheral bony impingement, and for repair or treatment of neural elements following da mage from prostate surgery ; excluding the developme nt and commercialization of tissue engineered products for human and animal therapeutics in the field of genitourinary