The phrase "are necessary for normal" is correct and usable in written English.
It can be used in contexts where you are discussing requirements or conditions that must be met for something to function properly or to be considered typical.
Example: "Certain nutrients are necessary for normal bodily functions and overall health."
Alternatives: "are essential for typical" or "are required for standard".
HCN channels expressed in the inner ear are necessary for normal balance function.
For example, receptor-mediated endocytosis enables cells to ingest molecules such as proteins that are necessary for normal cell functioning.
In other words, despite the innuendo in Levaux's article, they are necessary for normal cell function and there is no evidence to suggest that they support the ant-GMO activist thesis that GMOs are dangerous.
My research program investigates the molecular mechanisms whereby various congenital and acquired abnormalities result in 'dysfunctional' hemostasis (i.e., hemorrhage or thrombosis) to better understand the molecular mechanisms and interactions that are necessary for normal hemostasis.
The pluripotent stem cell-derived muscle fibers develop reservoirs of "satellite-like cells" that are necessary for normal adult muscles to repair damage, while the muscle from the previous study had much fewer of these cells.
If motions of the beak are necessary for normal song production, then disrupting the ability of a bird to perform these movements should alter the acoustic properties of its song.
In a subsequent study on mice, Johansson et al. [189] also showed that PFOS and PFOA increased the concentrations of proteins that are necessary for normal brain development, the tau protein and synaptophysin.
Class I MHC mediate signaling pathway, including H2-Kb and H2-Db as two members belonging to class Iα subfamily, is involved in retinogeniculate projections; β2M, TAP1, C1q and C3 co-subunits are necessary for normal and functional expression of MHCI at the cell-surface; CD3ζ and PirB are components of two distinguished MHCI receptors that participate in this signaling pathway.
"Most of the mouse Y chromosome genes are necessary for normal fertilization," Ward said in Kaunana, a University of Hawaii publication.
This shows that there is a sensitive period in early life when social interactions are necessary for normal myelination of axons to the prefrontal cortex.
Element(s) within the introns are necessary for normal, tissue-specific levels of expression.
