title: A long-wave absorbing form of chlorophyll a responsible for the "red drop" in fluorescence at 298 degrees K and the F723 band at 77 degrees K.
mesh_terms: D002734:Chlorophyll; D003080:Cold Temperature; D056890:Eukaryota; D005470:Fluorometry; D006863:Hydrogen-Ion Concentration; D010100:Oxygen; D010860:Pigments, Biological; D013053:Spectrophotometry; D013696:Temperature; D014465:Ultrasonics
chemical_list: D010860:Pigments, Biological; D002734:Chlorophyll; D010100:Oxygen