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In aqueous suspensions of purple membranes (pH 10.2, 0.4 M KCl) an intermediate having an absorption maximum at 570-575 nm (at -196 o C) was produced by first heating the M intermediate up to -30 o C and then stabilizing it by subsequent cooling to -60 o C. We suggest that this species is the intermediate N (or P or R) found and characterized earlier near room temperature....