In "Zellen-Studien", Jena Z. Naturw., 22 (1888) 685-882, German biologist Theodor Boveri presented decisive proof of the maintenance of chromosomal individuality. Boveri's work with sea urchins showed that it was necessary to have all chromosomes present in order for proper embryonic development to take place. This discovery was an important part of the Boveri–Sutton chromosome theory. His other significant discovery was the centrosome, which he first described and named in this paper.
J. Norman (ed) Morton's Medical Bibliography 5th ed (1991) 231.1.