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Figure 2. Transcriptome similarities of different embryos.Spearman correlation coefficients (ρ) of the transcriptome data from pairs of embryos from different species at different developmental stages. Higher ρ values indicate higher transcriptome similarity. The sampled stages are shown on the left. Different coloured lines indicate different developmental stages. For example, in the chart for the Dr–Xl comparison, the left end of the blue line indicates the Spearman correlation coefficients of a one-cell D. rerio embryo and a stage two X. laevis embryo. As the comparison proceeds to later developmental stages of X. laevis, or to the right of the blue line, the Spearman correlation coefficients decrease. Note that the ρ scores calculated for the early versus early stages (left part of the blue lines in each graph) are not the highest. The number in the upper right corner of each chart indicates the number of orthologous genes, which were used to calculate the transcriptome similarities. Error bars indicate s.d. Image published in: Irie N and Kuratani S (2011) Copyright © 2011, Nature Publishing Group, a division of Macmillan Publishers Limited. This image is reproduced with permission of the journal and the copyright holder. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license Larger Image Printer Friendly View

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