Isolation of a protein from beef liver which specifically stimulates the exchange of phosphatidylcholine.

Ammonium Sulfate Animals Carbon Isotopes Cattle Chemical Precipitation Choline/metabolism Chromatography, Gel Chromatography, Ion Exchange Liver Male Membranes, Artificial Microsomes, Liver/drug effects,metabolism Mitochondria, Liver/drug effects,metabolism Molecular Weight Phosphates/metabolism Phosphatidylcholines/metabolism Phosphatidylethanolamines Phosphorus Isotopes Proteins/isolation & purification,pharmacology Rats Tritium

Carbon Isotopes Membranes, Artificial Phosphates Phosphatidylcholines Phosphatidylethanolamines Phosphorus Isotopes Proteins Tritium Choline Ammonium Sulfate