March 11, 1969
Dear Dr. Harnwell:
Thank you for your invitation to attend your Commencement and to accept an honorary degree from the University of Pennsylvania. I am deeply honored and will be delighted to accept.
I would like to convey my sincere thanks to you, the faculty, and the trustees, and I am looking forward with pleasure to the occasion.
Sincerely,
Marshall Nirenberg
Laboratory of Biochemical Genetics
National Heart Institute