The phrase "are not indispensible" is correct and usable in written English, although "indispensable" is the correct spelling.
You can use it when discussing something that is not essential or necessary in a particular context.
Example: "While many tools are helpful, some are not indispensable for completing the project."
Alternatives: "are not essential" or "are not crucial".
Kojimoto demonstrated the endosteum and bone marrow were not indispensible for adequate callus formation and the periosteum was in fact an important contributor to osseous regeneration.
However, Nfil3 is not indispensible for Id2 expression in innate lymphocyte progenitors since both cNK cells and ILCs can still develop in the Nfil3 −/− mice, albeit at lower numbers.
As far as the latter is concerned, we find that Au promotes the growth of ZnO NWs on Si 001), but it is not indispensible as such and in fact hindered the growth of ZnO NWs when we used > 10 nm Au/Si 001) at 550°C, most likely due to a suppression in the formation of Au NPs.
However, the mutant mice were viable and reached the adult stage without any gross developmental abnormalities, suggesting that Gpr97 is not indispensible for normal development.
In adult mice, the overall production of insulin is not altered in Rfx6ΔBeta islets and thus Rfx6 is not indispensible for insulin production in β cells.
In the present study, we identified that the regulation of adenosine receptors is not indispensible for GalN/LPS-induced lethality and the elevated cellular adenosine induced by 5′-AMP pretreatment could directly interfere with NF- κB signaling pathway, suggesting a potential protective agent for amelioration of LPS-induced liver failure.
School cutbacks are particularly damaging: they are not only indispensible learning centers, but places for important community building.
The heparanase null mice produce longer HS chains in comparison to wildtype mice; however, there is no accumulation of the polysaccharide in organs, indicating that heparanase is not an indispensible enzyme for HS catabolism.
However, some lineages, although difficult as laboratory models, are indispensible to address specific evolutionary questions that are not applicable to standard models.
