Table 1

The mean number of nuclei in wild-type PointClouds

Stage cohort


5:0-3%

5:4-8%

5:9-25%

5:26-50%

5:51-75%

5:76-100%


No. of embryos

144

153

146

151

170

130

Mean no. of nuclei

6,065

6,079

6,095

6,093

5,997

5,898

SD no. of nuclei

334

249

266

241

281

285

95% CI

± 55

± 39

± 43

± 38

± 42

± 49


The standard deviation (SD) and 95% confidence intervals (CI) for the mean are shown for each of the temporal cohorts studied. The last two cohorts have lower numbers of nuclei, probably due to segmentation errors affecting data from increasingly dense dorsal regions (see [12]). Because the local nuclear density differences develop well before the embryos have reached these last two temporal cohorts, we conclude that the blastoderm density changes are due to nuclear movement, not the preferential loss or increase of nuclei.

Keränen et al. Genome Biology 2006 7:R124   doi:10.1186/gb-2006-7-12-r124

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