Figure 2. Relative expression levels for two genes (MAP2K1 and RMB24) in pair-wise comparisons of prenatal ages (21, 40, 70 and 90 days post-insemination). These genes differed significantly in relation to the factor ‘Period’ (p < 0.05, F-test in ANOVA), but showed no significant difference for the interaction ‘Breed x Period’. *p < 0.05 and **p < 0.01 indicates significant pair-wise comparisons by Student's t-test. A positive fold-change means that the first period in the comparison shows greater expression than the second period. Negative fold-change means that the second period in comparison presents greater expression than the first period.