The pyrimidine ring system is shown below.What is the source of the N-1 during the de novo biosynthesis of pyrimidines? 
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Insurance Card
A physical or digital card provided by an insurance company that verifies an individual's coverage and policy details.
Predetermination
Refers to the discovery of the maximum amount of money the carrier will pay for primary surgery, consultation service, postoperative care, and so on.
Carrier
(1) Associated with diseases inherited; (2) One who carries, transports; with insurance, it’s the company that provides the policy.
Approved Medical Bill
A health care invoice that has been processed and confirmed for payment by an insurance company or health plan.
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