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Structure of chlorophyll a and UV-visible absorption spectrum of chlorophyll a. (A) Chlorophyll a consists of a chlorophyllide a headgroup attached to a 4-isprene unit, 20 carbon, phytyl tail. This study investigates the presence of a non-canonical 3-isoprene unit, 15 carbon, farnesyl tail. (B) The UV-visible absorption spectrum of chlorophyll a.
