The expression of metastasis-associated protein 1 (MTA1) and MTA1s transcripts in rat placentas. A, Ethidium bromide-labeled gel for MTA1, MTA1s, and β glucuronidase (internal control) following real-time PCR (ReT-PCR). MTA1 and MTA1s were detected from 16 dg. Both negative controls (RT-) and water samples were negative (data not shown). B, A significant increase in expression of MTA1 mRNA was detected between 16 dg and 21 dg and 19 dg and 21 dg ($P < .001 and #P < .01, respectively). Expression of MTA1s increased between 19 dg and 21 dg (^P < .05). Samples were run in duplicates; data are mean ± standard error of the mean (n = 4/group).