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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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BIVALENT PAIRING IN AN INDUCED TETRAPLOID OF TRADESCANTIA GEORGE W. SKIRM Arnold Arboretum,Jamaica Plain, Massachusetts Received June 25, 1942 HE tetraploid forms of any genus are usually separated into two Tgroups, auto- and allopolyploid, depending on the behavior of the chromosomesat meiosis.
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