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Expression of HoxB1 in chicken heart forming cell culture is responsive to presence of retinoic acid (RA) activity. Primary heart forming region cells from 2–6ss chicken embryos were cultured in Endo-Grow media in presence of RA. Relative quantification of HoxB1 mRNA in comparison to control cells with no added RA. Standard deviations are indicated by error bars. The differences in comparison to the control at significance level of p < 0.005 are marked by (**); at p < 0.0001 by (***).
