The present invention provides {HEAD ~ an attenuated virus}, which is derived from Modified Vaccinia Ankara virus and characterized by {TAIL ~ the loss} of its capability to reproductively replicate in human cell lines 
The present invention provides { HEAD ~ an attenuated virus } , which is derived from Modified Vaccinia Ankara virus and characterized by { TAIL ~ the loss } of its capability to reproductively replicate in human cell lines
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