The phrase "are required for stem" is not complete and lacks context, making it difficult to assess its correctness in written English.
It could be used in a context where you are discussing the necessary components or elements needed for something related to "stem," such as STEM education or a biological stem.
Example: "These resources are required for stem development in educational programs."
Alternatives: "are necessary for stem" or "are essential for stem".
Since huge amount of cells are required for stem cell transplantations (Tsukamoto et al. 2013), our study suggests that HMF exposure could serve as a novel method to produce donor cells for stem cell therapy.
While CLV1 promotes stem cell differentiation, BAM receptors are required for stem cell maintenance [ 13].
A number of factors have been identified that are required for stem cell maintenance (e.g., EGF, LIF, GDNF, and bFGF) [ 32].
Our results indicate that loss of splicing factors enhances the single fbf mutant phenotype and that, like the fbfs, splicing factors are required for stem cell maintenance.
Both vernalization and long days are required for stem elongation (bolting) and flowering to occur in the second year of growth.
High levels of PLT activity are required for stem cell niche identity and maintenance, intermediate levels are essential for cell growth and proliferation in the meristem zone (MZ), and low levels are needed for cell expansion in the elongation zone (EZ) and allow further cell differentiation in the differentiation zone (DZ) [ 56].
These observations have led to the idea that an open chromatin structure may be required for stem cell pluripotency.
In several non-neural stem cell types and in germ cells, microRNAs have been found to be required for stem cell maintenance (for review, see [40]).
Our results are verified on multiple experiments and provide the first quantitative support to the hypothesis that continuity between extracellular and intracellular environments is required for stem cell fate determination.
While the functions and target genes of most miRNAs are still unknown, miRNAs have been engaged in many different functions, including developmental timing, patterning and embryogenesis, differentiation and organogenesis, growth control and apoptosis and may also be required for stem cell maintenance (reviewed in [9]).
Canonical Wnt signaling, which occurs through β-catenin bound to the HMG-box DNA binding protein Tcf/Lef, is required for stem cell self-renewal and progenitor cell proliferation in numerous vertebrate and invertebrate tissues, and de-regulation of this pathway is commonly associated with leukemia as well as epithelial cancers [33] [36].
