The phrase "alterations by several" is correct and usable in written English.
It can be used when referring to changes or modifications made by multiple individuals or entities.
Example: "The final report included alterations by several team members to improve clarity and accuracy."
Alternatives: "changes made by various" or "modifications from multiple".
These data support the idea that FGF21 is an independent indicator of genetic hepatocarcinogenesis. p53 may account for an additional or combinatory mechanism for regulating FGF21 expression in association with liver damage and carcinogenesis beyond metabolic alterations regulated by several nuclear receptors (NRs).
These alterations were monitored by several techniques such as N2 adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical impedance spectroscopy (EIS).
These alterations are regulated by several sets of growth factors and their cognate receptors [ 3].
It is important to highlight that upon admission, CF patients typically present all of these pulmonary alterations, as identified by several biopsies and necroscopic studies [ 24, 26].
In MPS patients, the long bones are often characterised by several alterations.
Various percentages of D310 alterations were also reported by several researchers in studies on thyroid, breast, cervical and gastric cancers [ 10, 13- 15].
The growth of preneoplastic nodules during the feeding of a carcinogenic 2-acetylaminofluorene (2-AAF) regimen is preceded by several alterations in the physiologic homeostasis.
Structural chromosomal alterations may be induced by several factors, such as DNA breaks, inhibition of DNA synthesis, and replication of altered DNA [ 14, 53].
Therefore, deregulation of only one of these components could be followed by alterations of several other members of the proteases/inhibitors families.
This critical gene is regulated by several epigenetic alterations at promoter sites including histone acetylation and promoter methylation [15] [17].
