Figure 3

Organ relationships derived from gene-expression profiles. Each tree was constructed using Cluster [32] with various numbers of elements, selected on the basis of three criteria as shown at the top. |x| > indicates the absolute log₂ ratio of each hybridization for a given element, and |y| > indicates absolute value of difference between maximum and minimum log₂ ratios among 13 hybridizations. Elements indicate the numbers of probes that were selected by the given criteria, and then used to construct the trees in the column below. Trees A-F were constructed using the signal-ratio data without a secondary normalization process. Trees G-L were constructed with the same elements as the panel immediately above after a median centering and a normalization process. Results were indistinguishable between hybridization success rates of 80% and 50%; the diagrams shown are from the analysis of 80% of the data. A gray bar marks the same set of tissues. 8DB, 8-day leaf blade; 2WB, 2-week leaf blade; AYB, adult leaf blade; 8DS, 8-day leaf sheath; 2WS, 2-week leaf sheath; EM, embryo; IM, immature ear; S, silk; H, husk; 4DR, 4-day root; 8DR, 8-day root; 2WR, 2-week root; NA, not applicable.