A new study shows that mammalian saliva and snake venom have a common genetic source and differ due to relatively modest differences in the evolution of that gene. The paper is:
Agneesh Barua, Ivan Koludarov, Alexander S. Mikheyev. "Co-option of the same ancestral gene family gave rise to mammalian and reptilian toxins." 19(1) BMC Biology (2021) DOI: 10.1186/s12915-021-01191-1
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