**The gene for the [[Adaptive Immune System - WikiBlood#Antigen Recognition|antigen]] required is inserted into a virus vector or cloned into bacteria
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**The gene for the [[Adaptive Immune System - WikiBlood#Antigen Recognition|antigen]] required is inserted into a virus vector or cloned into bacteria allowing endogenous expression
**Small [[Adaptive Immune System - WikiBlood#Antigen Recognition|antigens]], such as peptides can be synthetically produced
**Small [[Adaptive Immune System - WikiBlood#Antigen Recognition|antigens]], such as peptides can be synthetically produced
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**E.g. being developed constantly to fight the Inflenza viruses
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**E.g. Being developed constantly to fight the Inflenza viruses
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**E.g. Canary pox vaccines encoding rabies or FeLV spike proteins (canary pox is safe as it undergoes incomplete replication in mammalian skin cells)
*DNA coding for proteins ([[Adaptive Immune System - WikiBlood#Antigen Recognition|antigens]])
*DNA coding for proteins ([[Adaptive Immune System - WikiBlood#Antigen Recognition|antigens]])
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**Circular DNA plasmids expanded in disabled E.coli strains and then purified
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**Plasmids express the foreign gene insert at the site of injection