The purine ring system is shown below.What is the source of the N-1 atom during de novo biosynthesis of purines? 
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Well-Being
The state of being comfortable, healthy, or happy, encompassing both physical and psychological aspects of an individual's life.
Acquaintanceship Effect
The phenomenon where people tend to develop more positive evaluations of others as they become more familiar with them.
Predictions
Statements or estimates about future events based on analysis or understanding of past and current data.
Accuracy of Personality Judgments
The degree to which assessments or perceptions of others’ personalities are consistent with their actual traits and behaviors.
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