While it can be helpful for mentors working in an incubation cell to have expertise in the specific industry or sector that the cell focuses on, it is not always necessary. Effective mentors should possess a combination of skills and experiences, including business acumen, coaching and communication skills, and the ability to understand and support startups through the various stages of development. However, having relevant experience or expertise in the industry or sector can certainly be an advantage in terms of providing tailored guidance and insights to the startups.