PS is not recognized by the immune system as a threat since it's on the outside of regular dying cells, rather than being on the inside as it is in healthy cells.. that's apparently why the immune system doesn't attack cancer cells aggressively; the PS has flipped to the outside on them so they're essentially disguised as normal, dying cells, and bypassed by the immune system... bavi changes that...the immune system then detects nasty cells, and attacks the same cells bavi has latched onto since it targets the PS. this immune response may be requiring a bit of time...that's where the 'slower' comment comes from.
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