This genetic material is then naturally absorbed by cells which it forces to produce the 'spike' proteins found on the outside of the virus. Why did this happen? The thinking behind it is different vaccines provoke different parts of the immune system  the main substances being antibodies and T cells. Please make sure your browser supports JavaScript and cookies and that you are not blocking them from loading. 'Antibodies block the uptake of viruses into cells, and the T cells identify those cells that have been infected and then take them out, so you ideally want to have both.
This genetic material is not then naturally absorbed by cells.
( z0 absorb :ARG0 ( z1 cell ) :ARG1 ( z2 material :mod ( z3 gene ) :mod ( z4 this ) ) :ARG1-of ( z5 natural ) :polarity - :time ( z6 then ) )
(z0 / absorb-01
    :ARG0 (z1 / cell)
    :ARG1 (z2 / material
              :mod (z3 / gene)
              :mod (z4 / this))
    :ARG1-of (z5 / natural-03)
    :polarity -
    :time (z6 / then))
This genetic material is not then naturally absorbed by cells .
z2 :mod z3
z2 :mod z4
z0 :ARG1-of z5
z0 :time z6
z0 :polarity 0
z0 :ARG1 z2
z0 :ARG0 z1