They were anxious to learn how to preserve a wide variety of plant materials/species in the very cold liquid nitrogen world. He also traveled extensively both within and outside Japan to teach how to use PVS2 solution and preserve plant materials in liquid nitrogen. In total, over 200 plant species have been cryopreserved using PVS2 solution to date. To introduce a Panobinostat in vivo little about my personal memory of Sakai-sensei, I first met him in 1978, when I was a junior student at a university. I was totally impressed with the energy and enthusiasm Sakai-sensei had. I instantly decided to apply for the Graduate School of Science of Hokkaido

University to work for Sakai-sensei at ILTS. In 1979, he accepted me as the last official student before his obligatory retirement from

Hokkaido University. No sooner did I start my research at his lab than I realized how fortunate I was to have an opportunity to work under his supervision. I still clearly remember how different his teaching style was from other professors I had met before. He did not “teach” students, nor readily provide answers or solutions for the problem. Rather, he made us come up with research topics of our own and explore possible approaches to solve the see more problems. Every time we went to Sakai-sensei’s office and asked questions, he always gave us useful advice and encouraged us to try new topics or areas (often our curiosity was in an area outside of his GPX6 knowledge, or apparently

at least a few years of experiment was needed before obtaining any data worth publishing but Sakai-sensei never minded). Interestingly, now, 30 years later, I find myself doing exactly the same thing with my students. By nature, young people expect their professors to readily give answers for their questions. But I learned from Sakai-sensei that it is not the most effective way to teach young people the abilities necessary to be a good scientist or to live a good life in the sometimes complex and often challenging world. So, I sometimes (hopefully not too often) give my students a hard time—for I am very grateful to Sakai-sensei for how he trained me as a scientist and as a person. I have plenty of fond memories—and some sad memories, of course—with Sakai-sensei from my days at the graduate school and thereafter. I know that those who were fortunate enough to have had a chance to work or talk with Sakai-sensei know how lucky they are. These people are the ones who have been impressed and inspired by the leadership and knowledge Sakai-sensei generously provided to us. We must follow and pursue what Sakai-sensei intended to continue. We must keep working hard in plant cold hardiness and cryopreservation research. That is our mission. Sakai-sensei is survived by his wife, Taduko-san, two sons and their family members, and rose and rhododendron bushes and his other beloved plants in his garden.