sentence_1: Stem cells hold potential to treat conditions such as Alzheimer's disease, Parkinson's disease, stroke, spinal cord injury, heart disease, diabetes, burns, rheumatoid arthritis and osteoarthritis.
sentence_2: More than 100 million Americans suffer from cancer, diabetes, heart disease, Alzheimer's disease, Parkinson's disease, autoimmune disorders, spinal cord injuries, and other debilitating diseases and conditions.