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Isolation of intact photoreceptive organelles (eyespot apparatuses) involved in blue-light mediated photoresponses in a flagellate green alga (Spermatozopsis similis) allowed for the first time the identification of both 11-cis- and all-trans-retinal in a plant cell. Both isomers were identified by HPLC analysis in conjunction with UV spectra. Additionally, reconstitution of a distinct absorption...
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