other 2015 CB1 mRNA expression in the decidualized endometrium of women with ongoing pregnancies, miscarriage and ectopic pregnancies. ·doi:10.1371/journal.pone.0003969.g003 In decidualized endometrium from women with ectopic pregnancy, CB1 mRNA expression was lower than in women with intra-uterine pregnancies (p<0.05).