The phrase "are bound to several" is correct and usable in written English.
It can be used when indicating that something is obligated or destined to be associated with multiple items or factors.
Example: "The results of the study are bound to several variables that must be considered for accurate interpretation."
Alternatives: "are tied to several" or "are linked to several".
In the narrow selectivity filter of each pore, Cl− are bound to several sites through electrostatic interactions with helix dipoles and the partial charges of protein residues.
Compounds derived from the major histocompatibility complex (MHC) are bound to several urinary proteins.
In addition, most of the Aβ1-40 and Aβ1-42 in plasma are bound to several proteins (that is, apolipoprotein A-I, A-IV, E and J, α2-macroglobulin, complement factors, immunoglobulins, transthyretin, apoferritin and serum amyloid P component) and erythrocytes[ 19, 21].
The ribosomal subunits and the initiation factors in the model exist in free and bound forms, moreover, the ribosomal subunits can be bound to several regions of mRNA (the initiation site, the start codon, the coding part).
Thyroid hormones exist in two forms, one of which is bound to several proteins, and the other of which, a very small amount, is free.
Interestingly, Cry1 and Cry2 were bound to several more such sites than were the other circadian factors (Supplementary File 3).
During initiation of packaging, the pac site is bound to several G1P oligomers (Chai et al, 1995; Gual & Alonso, 1998).
In another study, anthracene and formed metabolites were bound to several cell-wall components, such as pectin, lignin, hemicellulose, and cellulose [ 23].
CuCl2 is the most widely isotope studied, for its potential role in PET imaging and therapy; it has been bound to several carrier that can be applied to monitor copper metabolism status and guide personalized copper chelator treatment in cancer patients [ 50].
Over 10 days of play at a North American Bridge Championships, there are bound to be several interesting deals.
Cabbies working 12-hour shifts are bound to span several of the prayer times.
