Original sentence: Presently, animal experimentation continues to be used in research that aims to solve medical problems from Alzheimer's disease, multiple sclerosis, spinal cord injury, and many more conditions in which there is no useful in vitro model system available
Edited sentence: Presently, animal experimentation continues to be vital in research that aims to solve medical problems from Alzheimer's disease, multiple sclerosis, spinal cord injury, and many more conditions in which there is no useful in vitro model system available