Arabidopsis Proteins Journal Article ARABIDOPSIS THALIANA HOMEOBOX 4 (ATHB4) Arabidopsis Arabidopsis thaliana Brassinosteroids DNA, Plant DNA-binding activity ETHYLENE-RESPONSIVE ELEMENT BINDING FACTOR-associated amphiphilic repression (EAR) motif Homeodomain Proteins Indoleacetic Acids Nuclear Localization Signals Plant Growth Regulators Repressor Proteins Research Support, Non-U.S. Gov't Transcription Factors auxins brassinosteroids gibberellins homeobox-leucine zipper protein ATHB-4, Arabidopsis homeodomain-leucine zipper hypocotyl elongation plant proximity shade avoidance syndrome shade avoidance syndrome. transcription factors transcriptional cofactors