Passage 3 (Questions 29-32): Over the last decade, the field of cell therapy has expanded rapidly. While some forms of cell therapy, such as hematopoietic stem cell transplantation to treat certain types of cancer, have been known for a while, it has only been in recent years __(29)__ the field has really started to expand. Cell therapy holds enormous promise for treating genetic diseases, cancer, and autoimmune disorders. However, there are still some teething problems that need to be __(30)__. Cells are biological material and notoriously unpredictable to grow and transport. Setting up a reliable, consistent and scalable manufacturing system is key to producing cell therapy on a wider scale. If this problem can be cracked, then the issue of excessively high pricing currently __(31)__ a mass rollout might also be at least partly solved. Last but not least, ensuring these therapies are safe for patients and adequately regulated is __(32)__. Question 29: Choose the best answer for blank (29).