Humans and a Bacterium Make Human Insulin

Humans and a bacterium make human insulin.How is this possible?

A) The human insulin gene appears naturally in the bacteriA.
B) The human insulin gene is a mutated form of a bacterial gene for bacterial insulin.
C) The human insulin gene was inserted into a bacterium's genome,and since the genetic code is nearly universal,the bacterium is able to produce human insulin.
D) The human insulin gene appears in bacteria that have been exposed to radiation treatments for diabetes.
E) The human insulin gene appears naturally in the bacteria that is an inhabitant of the GI tract of diabetic patients.

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