Instead, a subsequent exposure to IL-12 at extrafollicular sites appears to drive effector CD8+ T cell differentiation to completion.
However, following their activation and migration into the inner PALS (Reis e Sousa et al., 1997), CD8α+ DCs become hyporesponsive and cease IL-12 production (Reis e Sousa et al., 1999), raising the question of whether this initial early burst of IL-12 is sufficient to drive end-stage effector CD8+ T cell differentiation to completion.
In 1C115-HT serotonergic and 1C11NE noradrenergic differentiating cells, phosphatase activity levels kept increasing during the time course of both neuronal differentiation programs, till completion (day 4 for 1C115-HT andayay 12 for 1C11NE cells).
It would therefore be helpful to evaluate the effect of TGF-β3 on persistent fibroblast-myofibroblast differentiation beyond the completion of VFM wound closure.
At later stages (once the retinal cell types enter terminal differentiation after the completion of optic cup formation) its expression is additionally found in Müller Glia cells and photoreceptors.
Indeed, Keene has provided a useful general concept, which he referred to as the morphogenetic triangle, that describes the relationships between initiation of proliferation, initiation of differentiation and crown completion during odontogenesis.
(O'Connell et al, 1987; Rohan and Baron, 1989; Chu et al, 1990; Ewertz, 1990 , 1993 Field et al, 1992; Smith et al, 1994; Baron et al, 1996; Band et al, 2002) Taken together, these findings suggest that smoking during the period of breast tissue development and before final cellular differentiation (ie before completion of a first pregnancy) is not associated with breast cancer.
We conclude that Dicer and microRNAs function in this system to maintain the neural stem cell phenotype and to facilitate the completion of differentiation.
Many of the products of these genes regulate developmental processes and included several classes of homeobox genes, the homeobox genes (HOXC9, HOXA5), sry (sex determining region) homeobox genes (SOX4, SOX10, SOX 15, SOX 21), and the Iroquois homeobox genes (IRX1, IRX3, IRX4, IRX5), a signature that indicates completion of differentiation at the onset lactation.
Upon differentiation to hepatocytes and completion of organ regeneration, EpCAM expression is lost again [ 31, 38, 39].
