div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=indiana-university-department-of-biology-the-sonneborn-indiana-universityhtmlpage=1 data-page=1 class=ts-thumb lazyload 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 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader036vdocumentssitereader036viewer202208162060ff167b43def9272939be74html5thumbnails1jpg width=140 height=200 divdiv