A simple diagram to illustrate the expressionpattern of the gene Omp. Mean hybridization signals (± SD) at each time point were plotted. The expression of Omp was unchanged at 2 hr and 8 hr following OBX. Its first significant change in expression was a down-regulation at 16 hr post-OBX. Its expression continued to decrease at 48 hr. The fluctuation pattern of Omp expression was indexed by (0 0 0 -1 -1), shown in the upper right corner of the graph. Diagrams in the following figures were plotted similarly.