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Brassinosteroids (BRs) control virtually every aspect of plant growth and development.BRs act alone or with other exogenous and endogenous signals including auxin and light.To screen for the novel player involved in BR signaling in Arabidopsis,we employed cDNA overexpression strategy.We created a cDNA library to be expressed under the 35S overexpression promoter,and introduced into a weak brassinosteroid insensitive 1 (bri1) mutant.