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Ficele, G., Heinig, J. A., Kawauchi, H., Youson, J. H., Keeley, F. W., & Wright, G. M. (1998). Spatial and temporal distribution of proopiomelanotropin and proopiocortin mRNA during the life cycle of the sea lamprey: a qualitative and quantitative in situ hybridization study. General And Comparative Endocrinology, 110(2), 212-225.