This is a great opportunity to tie in your skills and comment on the connection you feel with the program/school/facility. You can finish up by asking the interviewer if they have any concerns or objections.
"When I initially saw your job posting I began to research this facility. What I found was a group of people with a genuine passion for what they do. I know I would be a great compliment to your team because my interests are strongly aligned with your mission. I also bring the education, experience and background that you are looking for. Is there any reason why you feel that I would not be a fit?"