In retrospect, the hypothesis of free cell formation would not seem to have been justified, however, since cell division, a feature not characteristic of crystallization processes, had frequently been observed by earlier microscopists, especially among single-celled organisms.
However, cell polarity is also important for asymmetric cell division, an inevitable characteristic of stem cells [ 60].
Assembly of cytokinetic nodes requires Mid1p, which recruits IQGAP-related Rng2p to the division site, after which other node components accumulate at the division site in a characteristic sequence [3 6].
The sublineage is a determined pattern of cell divisions which produces a characteristic set of progeny cell types.
Most birds have a characteristic division in chromosome size, with 5 or 6 large chromosomes, around 5 intermediate size chromosomes, and 25 to 30 very small chromosome pairs.
The maintenance of the pluripotent state of ES cells over many self-renewing divisions is associated with a characteristic (and stabilized) expression pattern of particular genes.
To distinguish the particle surface from the phagosome membrane, we have used a yeast mutant that forms buds but is impaired in division, providing the particle with a characteristic profile.
Thus, cell growth is counterbalanced by cell division such that cells maintain a characteristic size.
These cells then underwent a characteristic asymmetric division, with prominent central spindle microtubules clearly visible between the dividing halves of the spindle (white arrowheads, Fig. 3A).
Asymmetric division of stem cells is apparently not a characteristic of retinoblasts because the partially differentiated state of the retinoblasts has apparently already shifted them to symmetrical divisions.
