To·ne·ga·wa (tô-n??gä-wä), Susumu Born 1939. Japanese molecular biologist. He won a 1987 Nobel Prize for discovering how the genetic material of certain cells of the immune system can rearrange itself to produce diverse antibodies.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.