In recent years, some taxonomic controversy has occurred over the genus of North American rat snakes. Based on mitochondrial DNA, Utiger et al. (2002) showed that North American rat snakes of the genus Elaphe, along with closely related genera such as Pituophis and Lampropeltis, form a monophyletic group separate from Old World members of the genus.
A pinched nerve is a type of injury or damage to a nerve or a group of nerves. The injury can result from compression, constriction, or stretching. A pinched nerve can lead to other conditions and cause temporary or permanent damage depending on the extent of the injury. pinched nerve is a type of injury or damage to a nerve or a group of nerves. The injury can result from compression, constriction, or stretching. A pinched nerve can lead to other conditions and cause temporary or permanent damage depending on the extent of the injury.
As esophageal cancer advances, it can cause complications, such as: Obstruction of the esophagus. Cancer may make it difficult or impossible for food and liquid to pass through your esophagus. Pain. Advanced esophageal cancer can cause pain. Bleeding in the esophagus. Esophageal cancer can cause bleeding. Though bleeding is usually gradual, it can be sudden and severe at times. Prevention. You can take steps to reduce your risk of esophageal cancer.