AMT1 ;2 Ammonium Compounds Arabidopsis Proteins Basic-Leucine Zipper Transcription Factors Cation Transport Proteins EC 1.7.- HY5 HY5 protein, Arabidopsis Journal Article Light regulation N762921K75 NIR1 protein, Arabidopsis Nitrite Reductases Nitrite reductase NIR1 Nitrogen Nitrogen metabolism Nuclear Proteins Plant Proteins RNA, Messenger Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Root development ammonium transporters, plant