4AQL, 3E0L, 2UZ9961514544ENSG00000119125ENSMUSG00000058624Q9Y2T3Q9R111NM_001351572NM_001351573NM_010266NP_001338501NP_001338502NP_034396Guanine deaminase also known as cypin, guanase, guanine aminase, GAH, and guanine aminohydrolase is an aminohydrolase enzyme which converts guanine to xanthine.

[5][6][7] Cypin is a major cytosolic protein that interacts with PSD-95.

It promotes localized microtubule assembly in neuronal dendrites.

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