“…(Segal & Scher, 1967;Hamilton, 1971). This steroid stimulates the synthesis of the contractile protein, actomyosin (Needham & Cawkwell, 1957), and also reduces the threshold of stimulation of the myo¬ metrial cell to oxytocin (Fitzpatrick, 1960;Kuriyama, 1961;Knifton, 1967;Brinsfield, 1968).…”