for thrombin time, and is used when heparin is present in the sample. The enzyme is unaffected by heparin. References Further reading Hays WST, Conant Sheila. 2007. Biology and Impacts of Pacific Island Invasive Species. 1. A Worldwide Review of Effects of the Small Indian Mongoose, Herpestes javanicus (Carnivora: Herpestidae). Pacific Science 61 (1): 3–16. Linnaeus, C. 1758. Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Tenth Edition. Holmiæ. Stockholm. 824 pp. (Coluber atrox, p. 222.) Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. . O'Shea M. 2005. Venomous Snakes of the World. Princeton, New Jersey: Princeton University Press. 160 pp. . External links IUCN Red List of Threatened Species atrox Snakes of South America Snakes of the Caribbean Reptiles of Bolivia Reptiles of Brazil Reptiles of Colombia Reptiles of Ecuador Reptiles of French Guiana Reptiles of Trinidad and Tobago Reptiles of Guyana Reptiles of Panama Reptiles of Peru Reptiles of Suriname Reptiles of Venezuela Reptiles described in 1758 Taxa named by Carl Linnaeus