They are relatively large molecules that are expensive to produce. In a new study by Garrett et al., a complete set of overlapping linear peptides on a phage display backbone was developed, which spanned the entire spike protein. Read more from this series in parts one, two, three, and four. N-terminal domain (NTD); receptor-binding domain (RBD); ... [+] carboxy-terminal domain (CTD); fusion peptid (FP); heptad repeat (HP); transmembrane and carboxy terminus (TM+CT) Garrett et al. It is this second class that provides the most interest.
NTD domain involves muscle coordination.
( z0 involve :ARG1 ( z1 coordinate :ARG1 ( z2 muscle ) ) :ARG2 ( z3 domain :name ( z4 name :op "NTD" ) ) )
(z0 / involve-01
    :ARG1 (z1 / coordinate-01
              :ARG1 (z2 / muscle))
    :ARG2 (z3 / domain
              :name (z4 / name
                        :op1 "NTD")))
NTD domain involves muscle coordination .
z3 :name z4
z4 :op1 0
z0 :ARG2 z3
z1 :ARG1 z2
z0 :ARG1 z1