Four families ( Xenopeltidae Colubridae Elapidae Viperidae ) and 30 species in Serpentes .

蛇亚目4科（闪鳞蛇科、游蛇科、眼镜蛇科、 蝰 科）30种。

Snake Venom thrombin-like enzyme ( TLE ) is a class of fibrinolytic activity of serine proteinases In the Snake Venom of the most widely distributed Viperidae the most abundant .

蛇毒类凝血酶是一类具有溶纤活性的丝氨酸蛋白酶类，在 蝰 科 蛇类的蛇毒中分布 最 广， 含量最为丰富。

The recently discovered coagulation factor ⅸ / factor ⅹ binding protein family is widely present in the venom of viperidae snake which is an unique subfamily in the C type animal lectin superfamily .

凝血因子 Ⅸ/Ⅹ结合蛋白家族是近来发现的C型动物凝集素超家族中一个亚家族。