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Absence of a normal nuclear division in PMCs in anthers with FDR in an F1 wheat x rye hybrid. Rye centromeres are labeled green; chromatin stained red. Abnormal condensation of chromatin; sister centromeres away from the tension zone are fused; those under tension are separated but appear to resist separation of chromatids. On far right, phragmoplast (green) approaches the nucleus split into two parts.
