Which of the following are the nitrogen source of

单项选择题

Which of the following are the nitrogen source of urea ?

A、carbomoyl phosphate and aspartate
B、carbomoyl phosphate and ornithine
C、α-amino group and γ-amino group of ornithine
D、α-amino group of citrulline and α-amino group of arginine
E、γ-amino group of ornithine and glycine

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