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CSU1 Negatively Regulates SPA1 in the Dark.
Protein levels of SPA1, SPA2, SPA3, and SPA4 in wild-type and csu1 seedlings were detected by SPA1, SPA2, SPA3, and SPA4 antibodies, respectively. Plant total proteins were extracted from 5-d-old seedlings grown in the dark. spa123 and spa124 were used as negative controls. CSN6 levels were used as loading controls.
