1U5R:
reference: Crystal Structure of the TAO2 Kinase Domain; Activation and Specificity of a Ste20p MAP3K., Zhou T, Raman M, Gao Y, Earnest S, Chen Z, Machius M, Cobb MH, Goldsmith EJ, Structure (Camb) 2004 Oct;12(10):1891-900. PMID: 15458637

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