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Essex-Fraser, P., Steele, S. L., Bernier, N. J., Murray, B. W., Stevens, E. D., & Wright, P. A. (2005). Expression of four glutamine synthetase genes in the early stages of development of rainbow trout (Oncorhynchus mykiss) in relationship to nitrogen excretion. Journal Of Biological Chemistry, 280(21), 20268-20273.