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THE ACETYLCHOLINESTERASE AND PSEUDO‐ CHOLINESTERASE CONTENTS OF HUMAN PLACENTA AT TERM

The acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) activities of human term placentas have been studied. Perfusion of placentas indicated that most of the AChE and all the BuChE content of the human placenta are due to its blood content. By comparison, rabbit livers, studied similarly, retained most of their contents of both enzymes following perfusion. Histochemical examination or well‐perfused placentas suggests that trapped intact erythrocytes and the stroma of hemolyzed red cells are the probable source of ‘placental’ AChE reported previously.