Additional file 3.

SOX9 distribution in the bipotential gonad. SOX9 protein was examined in the day 25 fetal XY gonad to determine its distribution at the start of the culture period. At this time, SOX9 was already localized in the nuclei (black arrowhead) of many somatic cells, but some weak cytoplasmic staining (red arrowhead) also remained.

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Pask et al. BMC Biology 2010 8:113   doi:10.1186/1741-7007-8-113