THE CELL AND THE ORGANISM: The Role of Subdivisional Cell Replication in the Development and Maintenance of the Multicellular Organism

摘要

Evidence of new cell formation from nucleoli (subdivisional cell replication) was observed in vitro and in vivo Mouse melanoma cells, human fibroblasts, and rat mast cells were observed in tissue culture with phase contrast time-lapse cinematography Evidence of subdivisional cell replication seen in tissue culture was supported by observations of mast cells, cervical epithelial cells, melanoma cells, keratinocytes, and fungal spores in vivo Indirect evidence for subdivisional cell replication was thepresence of differentiated form and function in nuclei and nucleoli. Synergism between subdivisional replication and mitotic replication (subdivisional expansion) is believed to be a key to morphogenesis, whereby cellular and subdivisional zones act asbiologic "molds". It is believed that subdivisional cell replication has a key role in maintenance of differentiated form in multicellular organisms, as well as in morphogenesis.