Early work of phosphatidylcholine synthesis owes much to experi- ments in Morris Kates' lab. By using radiolabelled precursors he was able to demonstrate the Kennedy pathway reactions in plants [see
52,53]. For PtdCho we showed that the latter reactions were much more important than PtdEtn methylation in soybean [56]. We followed this up by purifying and characterising the choline [54] and ethanol- amine kinases [55] as well as studying other features of the Kennedy pathway