Give a comparative account of purine and pyrimidine nucleotide degradation.

Purine and pyrimidine nucleotide degradation pathways differ significantly in their enzymes, intermediates, and end products.  

Purine Nucleotide Degradation:  
Purine nucleotides (adenosine monophosphate, AMP, and guanosine monophosphate, GMP) undergo dephosphorylation by nucleotidases to form nucleosides (adenosine and guanosine). Adenosine is further deaminated by adenosine deaminase to inosine, while guanosine __________ _________ ___ ___ ________ _______ ____.
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