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In situ hybridization of MtSERF1 RNA probe. The globular-stage embryo shows expression over the whole embryo (left), whereas in the heart-stage embryo (right), expression is localized to a small group of cells (arrow) in the developing shoot meristem just below the apical notch (arrow). S, Suspensor-like structure; C, callus cells. Bars = 40 μm.
