div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Indiana University Department of Biology The Sonneborn Indiana University Department of Biology The Sonneborn Lecture 1986 MARK PTASHNE Professor of Biochemistry and Molecular src=https:reader036vdocumentssitereader036viewer202208162060ff167b43def9272939be74html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv