https://www.elsevierhealth.com/media/us/samplechapters/9780323053716/Cha...
http://www.ib.bioninja.com.au/standard-level/topic-3-chemicals-of-life/3...
http://www.biology.iupui.edu/biocourses/N100/2k4ch3carbolipidnotes.html
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