March 5, 1990 Dear Dr. Nirenberg: Just a brief note to thank you for taking the time to come and talk with our students about homeoboxes. Many of the students have come to me to ask that I express their appreciation also. I have had any number of comments about how interesting your talk was. Many thanks. It of course remains to be seen how effective this series of presentations will be in encouraging students to get into the research laboratory. Sincerely, Gerry Goeringer G. C. Goeringer, Ph.D.