title: A problem cannot be solved unless one sees it (F. Schmitz 1883). Lothar geitler (1899-1990) and the endosymbionts: revolutionary as a twen, conservative till ripe old age.
authors.affiliation: Institut für Biochemie, Universität zu Köln, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Jaenicke
mesh_terms: D049672:History, 19th Century; D049673:History, 20th Century; D010802:Phylogeny; D013559:Symbiosis