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Both stems and roots grow typically from their tips. This growth is centered just back from the apex of the stem or root in a particular zone of cells that undergo elongation. As these cells elongate they mature and can specialize.
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The actin network is organized differently during division but it does not disappear as do the cortical microtubules. RLP stains a central filamentous cortical band as the chromatin begins to condense (preprophase); it stains the mitotic spindle (as recently shown by Seagull et al. [Seagull, R.
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The CaMV promoter gene has been found to be a "hot spot" for recombination leading to exchange of gene sequences at elevated frequency (Ho et al Microbial Ecology in Health and Disease (no.4,1999)..
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