As for the presence of large NGF [nerve growth factor] sources in snake venom and male genital organs, they may be conceived as instances of bizarre evolutionary gene expression. — Rita Levi-Montalcini Copy Share Image
![“As for the presence of large NGF [nerve growth factor] sources in snake venom and male genital organs, they may be conceived as instances of bizarre evolutionary gene expression.” quote by Rita Levi-Montalcini](https://sms4smile.com/quotes/i/78c/rita-levi-montalcini-22012_bizarre_as-for-the-presence-of-large-ngf-nerve-g_91796.jpg)