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" ... Another mutation, the P681H mutation, in the spike protein may help you help the virus more. This mutation swaps a P (proline) amino acid to an H (histidine) amino acid on the stem of the Covid-19 coronavirus spikes. This change can then allow your cells’ enzymes reach the spikes to then cut the spikes and allow them to connect to your cell receptors. Yes, the Covid-19 coronavirus is akin to an awful and manipulative date, using you against yourself. ... "
" ... The third mutant in S1, the substitution of proline for arginine (P681R), is located near the cleavage site between S1 and S2. This change may increase the infectivity of the virus particles by facilitating cleavage of the S precursor protein to the active S1/S2 configuration. The contribution of the two remaining amino acid substitutions in the S2 portions is also unique to the Indian variant. The full extent of spike mutations in the B.1.617 variant can be found in the figure below. ... "