May 12, 1972
Dear Dr. Nirenberg:
Almost two months have passed since I left your laboratory. I believe you have already settled down in your new laboratory. When I was leaving Bethesda, you were so busy I could not find a time to express my thanks to you and Mrs. Nirenberg for your kindness and discussions in my stay at your laboratory. I stopped by in Europe, spent fourteen days in several places and returned to my home in Japan. I am now beginning to set up a new, but small laboratory oriented to molecular ? neurobiology. I hope we could establish a basis in neurobiology in Japan. Whenever you have a chance to visit Japan, (actually we wish to invite you for the opening ceremony of our new institute being held this coming fall.) please contact with me without hesitation.  You are the most welcomed person for me and also for molecular biologists in Japan seeking for new field.
With best regards
Takehiko Amano