Assertion: ngf's activity | /r/HasProperty | dramatic
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text: Despite the purification of NGF, its dramatic activity and unusual sources—mouse tumors, snake venom, and mouse salivary glands—left many scientists skeptical of its physiological relevance, says Pietro Calissano, a neuroscientist at the Italian National Research Council, Vice President of EBRI, and close friend of Levi-Montalcini.