in part two of this series. Receptor binding domain in up and down positions. However, when in the up position, the receptor-binding domain is open to ACE2 binding. These are the carboxy-terminal, the n-terminal domain, the fusion peptide, and the carboxy-terminus of the S2 subunit. On the other hand, the V nanobody improves the ability of V+E to bind by stabilizing the receptor-binding domain in the two-up position, allowing the E nanobody a better opportunity to bind and prematurely activate the trimer.
Not every animal was able to receive the vaccine.
( z0 possible :ARG1 ( z1 receive :ARG0 ( z2 animal :mod ( z3 every :polarity - ) ) :ARG1 ( z4 vaccine ) ) )
(z0 / possible-01
    :ARG1 (z1 / receive-01
              :ARG0 (z2 / animal
                        :mod (z3 / every
                                 :polarity -))
              :ARG1 (z4 / vaccine)))
Not every animal was able to receive the vaccine .
z3 :polarity 0
z2 :mod z3
z0 :ARG1 z1
z1 :ARG0 z2
z1 :ARG1 z4