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‘Disappearance' of PGH2 when incubated with microsomes from vascular tissue. The isolated tissues were as indicated. Injection into the superfusing fluid of the endoperoxide PGH2 caused the rabbit aortic strip to contract, but when mixed with various amounts of microsomes from aorta (AM) the response was reduced or abolished. Calibrating injections of various PGs are also shown. From Gryglewski et al. (1976), with permission.
