Membrane phosphatidylethanolamine composition based on http://www.biomedcentral.com/1752-0509/3/38
14.0 pe140_p + 76.0 pe160_p + 4.0 pe161_p + 2.0 pe180_p + 3.0 pe181_p ⇌ 2.0 pe2_ST_p
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