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The phosphatidylcholine biosynthetic process that begins with three consecutive N-methylation steps that are carried out on phospho-bases, phosphoethanolamine, phospho-N-methylethanolamine, and phospho-N-dimethylethanolamine; the process ends with the conversion of a phosphatidyl-N-dimethylethanolamine to a phosphatidylcholine. [MetaCyc:PWY4FS-2]
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