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In subsequent sections of a utero-placental unit obtained in day 15 of pregnancy, the multilayered subplacenta (SP) gave rise to the placental sprouts, and to the syncytial streamers that penetrate the adjacent decidua. The subplacenta, the placental sprouts and the syncytial streamers expressed VEGF, Flt-1, KDR, B2R and eNOS. Cytotrophoblasts were characterized by cytokeratin (CK) staining. Bar = 100 μm.
