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Axin2, Wnt-related cyclic gene oscillates opposite phase to Hes1 (Notch-related gene) suggesting a phase conservation between mouse and chicken. Raf1, an Fgf-related gene previously shown to have two peaks of expression during mouse somitogenesis showed the same pattern of expression in chicken. Phase of gene expression varies from 0 to 1 and corresponds to 120 and 90 minutes periodicity for mouse and chicken respectively.
