The phrase "are multiple mechanisms of" is correct and usable in written English.
It can be used when discussing various methods or processes that exist within a particular context or system.
Example: "In the study of human behavior, there are multiple mechanisms of influence that shape our decisions."
Alternatives: "exist various mechanisms of" or "there are several mechanisms of".
There are multiple mechanisms of resistance to the second generation ALK-inhibitors [19].
There are multiple mechanisms of action for NSAID-induced angioedema, including COX-1 inhibition leading to production of the inflammatory mediators, cysteinyl leukotrienes, and IgE-mediated hypersensitivity [35].
There are multiple mechanisms of action associated with PUVA, including effects on the skin's immune system.
Indeed, there are multiple mechanisms of induction and regulation associated with the activation of IDO (for review, see [42]).
It is also becoming clear that there are multiple mechanisms of CNV formation, even for the small subset of CNVs represented in this study.
There are multiple mechanisms of spontaneous mutation (Drake, 1993).
The mechanism put forward in this study, by which αB-crystallin could inhibit fibril formation by binding to the fibrils and inhibiting their elongation, suggests that there may be multiple mechanisms of chaperone action.
Diabetes may elicit an increased compaction rate as well as an earlier onset of cataract formation, though there may be multiple mechanisms of action dependent on disease type, duration, or treatment strategy.
However, an alternative viewpoint, argued in this discussion, is that there are multiple mechanisms for the development of ER-negative IBCs, including many from ER-positive precursors by potentially reversible mechanisms.
Of note, there appear to be multiple mechanisms for inducing antitumor effects of PPAR γ agonists, some of which are independent of PPAR γ signals [ 83].
Although Ca2+ entry is known to mediate cellular responses to vascular endothelial growth factor (VEGF), there are multiple mechanisms and not all of them are defined or understood.
