Membrane phosphatidylglycerol composition based on http://www.biomedcentral.com/1752-0509/3/38
14.0 pg140_p + 76.0 pg160_p + 4.0 pg161_p + 2.0 pg180_p + 3.0 pg181_p ⇌ 2.0 pg2_ST_p
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