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Syncytin 1 protein content in trophoblast microvesicles (MV). Western blot for syncytin 1 protein (50 000 and 73 000 molecular weight) was performed on: (a) BeWo cell lysates and BeWo-derived MV; (b) isolated MV shed from first-trimester (n = 5) and normal term (n = 4) placental explants; and (c) isolated MV shed from pre-eclamptic term placental explants (n = 4).
