Early logistical responses to the invasion were confused, as the divisions necessary for counter-attacks fell under a different jurisdiction than those defending the coast.
Besides DNA repair mechanisms, the existence of cellular hierarchies that originate with a stem cell serve to reduce the number of divisions necessary for normal physiology.
Secondly, given the large number of cell divisions necessary for tumour development, estimated at 600 by Coller et al, (2001), an alteration in mitochondrial function that is exceedingly subtle in terms of its biochemical or physiological manifestation may be all that is necessary to alter significantly the probability of tumour formation (Augenlicht and Heerdt, 2001).
Indeed, growth repression by JAs has been directly linked to inhibition of cell-cycle progression [ 67], in addition to directly antagonizing the growth promoting activity of gibberellic acid [ 31], thus providing evidence that JAs could be direct antagonists of SE induction, based in part on the assumption that cell division is necessary for embryogenic tissue formation.
In severe hypospadias, urethral plate division is necessary for curvature correction.
But this division was necessary for evaluation the whole cohort of patients.
We failed to reprogram ALS IV fibroblasts, probably due to their poor proliferation rate in culture, as active cell division is necessary for reprogramming to occur.
This division was necessary for the subsequent merging procedure to work, because cohorts differed substantially in terms of the relative proportions of ER -and ER+ tumors and because ER- and ER+ tumors show widely different gene expression profiles [ 40, 41].
Loss and replacement of a complete multi-gene cell division mechanism necessary for viability of a cell population seems an unlikely scenario in case of one incorporating either FtsZ or tubulin, but the similarity of ancestral FtZs and tubulins could have meant such ancestral proteins could have been easily interchangeable within a common gene organization.
