Basic helix-loop-helix/helix-loop-helix (bHLH/HLH) transcription factors play important roles in plant development. Many reports have suggested that bHLH/HLH proteins participate in brassinosteroid (BR) hormone signaling pathways to promote cell elongation. | Characterization of bHLH HLH genes that are involved in brassinosteroid BR signaling in fiber development of cotton Gossypium hirsutum