passages.id: split_4_test_1403_passage
passages.type: progene_text
passages.text: These results suggest that both AREB1 and AREB2 function as transcriptional activators in the ABA - inducible expression of rd29B , and further that ABA - dependent posttranscriptional activation of AREB1 and AREB2 , probably by phosphorylation , is necessary for their maximum activation by ABA .