Source:http://linkedlifedata.com/resource/umls/id/C0033464
MSH: The first phase of cell nucleus division, in which the CHROMOSOMES become visible, the CELL NUCLEUS starts to lose its identity, the MITOTIC SPINDLE APPARATUS appears, and the CENTRIOLES migrate toward opposite poles.,GO: A cell cycle process comprising the steps by which a cell progresses through prophase, the first stage of chromosome segregation in the cell cycle. Canonically, chromosomes condense and the two daughter centrioles and their asters migrate toward the poles of the cell. [GOC:ai, GOC:dph, GOC:mah]