Figure 1From: Concurrent profiling of indole-3-acetic acid, abscisic acid, and cytokinins and structurally related purines by high-performance-liquid-chromatography tandem electrospray mass spectrometryThe structural backbone of some aromatic and isoprenoid cytokinins. The ‘R’ corresponds to sites of ribosyl and phosphorybosyl functional groups.Back to article page