[word=Dynarski | lemma=dynarskus | □=□]
[word=Dynarski | lemma=dynarskus | tag=□]
[word=Dynarski | lemma=dynarskus | lemma=□]
I have watched an angry Russell 's viper in Myanmar striking wildly at anyone or anything that came near it . The family is poorly known and no comprehensive treatment of the Afrotropical species has been published , though a generic key is available ( Benoit 1977b ) . Viperid venoms , on the other hand , contain an abundance of protein-degrading enzymes called proteases , which produce the symptoms like those encountered by the unlucky rattlesnake handler : strong local swelling and necrosis , and blood loss from cardiovascular damage complicated by coagulopathy , or disruption of the blood clotting system . But as with that unlucky snake handler in Arizona or crazy museum curators , the fact is that many bites in this country occur to people who pick snakes up . The pattern now emerging suggests that early in the evolution of these snakes , genes for enzymes already serving important functions in the body were duplicated to create identical copies elsewhere in the genome .