The purine ring system is shown below. What is the source of the atoms 5 and 7 during de novo biosynthesis of purines? 
Definitions:
Classes
Categories or groupings into which data points are organized for statistical analysis or presentation.
Cumulative Relative Frequency
A measure showing the percentage of observations that fall below a particular value in a dataset.
Total Number
The sum or total count of units or elements in a set or group.
Data Set
A collection of data points or values gathered from experiments or observations.
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