The phrase "a permanent portion of" is correct and usable in written English.
It can be used to describe something that is a lasting or integral part of a whole.
Example: "The new policy will become a permanent portion of our operational framework."
Alternatives: "an enduring part of" or "a lasting segment of".
Another source of melanocytes appears to be in the sweat glands of acral volar skin in humans and mice (Fig. 3B); the Nishimura laboratory recently identified the secretory lower permanent portion of the sweat gland as a new anatomical niche for MSCs that can provide the epidermis with differentiated melanocytes (Okamoto et al., 2014).
Experimental evidence indicates that the MSCs in mice can function in a similar manner to the amelanotic population in the lower permanent portion of the human hair follicle.
Indeed, early studies (Nishimura, 2011; Staricco, 1959, 1963) identified a population of cells in the outer root sheath of the lower permanent portion of the hair follicle that lacks melanin (i.e. is amelanotic) and that becomes activated following UV irradiation or epidermal wounding, and hence acts as a reservoir for skin melanocytes (Cui et al., 1991).
The zooid walls, which constitute the most permanent portion of the colony, generally are calcareous (i.e., impregnated with calcium carbonate), giving bryozoans a fossil record that dates from the Ordovician onward (i.e., from about 500 million years ago).
Studies on mice and human skin both show the existence of skin stem cells in the lower permanent portion of the hair follicle, or bulge [35], [38], [39].
These quiescent MSCs reside in the lower permanent portion of the hair follicle as undifferentiated, slow-cycling melanoblasts (Fig. 3A), marked by expression of a Dct:lacZ transgene, and provide the hair matrix with amplifying and differentiating melanocytes for that hair unit.
During this portion of the course students will all implement some basic algorithms within ImageStack, and competitions will be held to select which submissions will become a permanent part of ImageStack (with student permission).
Permanent transfers of a portion of a company's allocation to another company were not permitted.
Either way, the most obvious option for a permanent replacement of the damaged portion of the overpass would be the same as in Yonkers, a prefabricated bridge built off site.
