Representative DIGE gel image of differentially expressed proteins in Yorkshire and Meishan fetal ovaries at gestation day 55.

<p>The proteins extracted from the Yorkshire and Meishan fetal ovaries on day 55 of gestation samples were labelled with Cy3 and Cy5, respectively. An internal standard protein sample (a mixture of Yorkshire and Meishan fetal ovaries on day 55 of gestation samples) was labeled with the Cy2 dye. The S2-S11 and S12-S16 spots represent up-regulated proteins, while the others spots represent down-regulated proteins in the in Yorkshire fetal ovaries samples compared with the Meishan fetal ovaries samples. The number in the figure corresponds to the number shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0135514#pone.0135514.t001" target="_blank">Table 1</a>.