FIG. 2.

Hierarchical cluster analysis of our microarray results for genes expressed in the crypt bottom (bottom vs. top). (A) Data set 1. (B) Data set 2. (C) Color bar for expression ratios. This analysis shows that there are two sets of genes with increased expression (reddish brown color) in the crypt bottom: genes selectively expressed in the bottom (A); genes that are expressed in a gradient fashion (B) from highest in the crypt bottom to lowest in the crypt top. Color images available online at www.liebertpub.com/scd