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BMP signals attenuate MyoD induction by surface ectoderm at varying axial levels. Paraxial mesoderm was isolated from the indicated axial level and cultured with the overlying ectoderm in the presence of medium condition by Noggin-secreting CHO cells (lanes 1,3,5) or medium conditioned by control CHO cells (lanes 2,4,6). Gene expression was analyzed by RT–PCR. Similar results were obtained in at least three independent experiments.
