This transition is marked by the appearance of sparse and tiny neoblast
of chlorite and rare andalusite in dotted slates, which are gradually replaced by medium- to coarse-grained schists where porphyroblasts of plagioclase, muscovite and cordierite are widespread and easily recognized to the naked eye.
This process commences with the formation of blastema, which is composed by neoblast
which are undifferentiated and totipotent cells.
Deciphering the molecular machinery of stem cells: a look at the neoblast
gene expression profile.
Some investigations have linked asexuality to the inversion of some genetic factors that otherwise inhibit the transformation of neoblasts
into germ cells in fissiparous specimens (Grasso and Benazzi, 1973).
or undifferentiated cells may be multipotent stem cells and express the CD133 protein, the potential to differentiate into somatic or germ cells depending on whether microenvironmental conditions are favorable or not (Onal et al.
This amazing plasticity relies on the presence of a population of adult pluripotent stem cell, the neoblasts
, which are able to become any type of cell.
The study, entitled "zic-1 Expression in Planarian Neoblasts
after Injury Controls Anterior Pole Regeneration," was reported in PLOS Genetics.
The team found that the worms' stem cells, known as neoblasts
, march out, multiply, and start rebuilding tissues lost to amputation.
Overlapping and divergent actions of estrogens and the neurotrophins on cell fate and p53-dependent signal transduction in conditionally immortalized cerebral cortex neoblasts