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Progesterone (P4) receptor (PGR)-B in colon muscle cells transfected with a plasmid containing DNA of PGR-B and PGR-AB for 48 h in tissue culture. Quantitative real-time PCR (qPCR) shows that the expression of PGR-B is significantly higher compared with that of controls (incubated with buffer, tissue culture medium, or empty vector) (*,**P < 0.005, determined by ANOVA). Values are means ± SE; n = 4.
