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Double-labeling of the root apex for transcripts of cdc2Os3 and of a gene for histone H4. a and b, Detection of hybridization signals with the biotin-labeled antisense probe for histone H4 transcripts (red). c and d, Same section after detection of the digoxigenin-labeled cdc2Os3 probe (brownish-purple). Arrowheads indicate cells labeled with the cdc2Os3 antisense probes. Bar = 20 μm.
