General descriptive characteristics of expressions in eutopic and ectopic endometrium. (A) Histogram of frequency distribution of probes (genes) for different groups of expression levels (in log2) in eighteen (18) autologous, paired eutopic (blank bar) and ectopic (hatched bar) endometrial samples. (B) Two-way representation of unsupervised hierarchical cluster analysis (HCA) of the expression levels (in logarithmic scale) of all the target probes/genes (Y-axis) in each sample (each column), eutopic labelled as A and ectopic labelled as B from all subjects (n = 18) and their clustering based on expressional distance (Pearson correlation coefficient) between samples in dendrogram formation (X-axis). Each horizontal line represents a single probe, and each column represents a single sample. Relative expression of each probe is colour-coded: high (red) and low (blue), as indicated in the colour legend. Categorical annotations of each sample are shown in the X-axis. The samples cluster by cycle phase and severity stages, as shown by the bar at the bottom of the heat map: proliferative phase (black bar), secretory phase (crossed white bar), stage 3 (red crossed bar) and stage 4 (blank red bar). A, eutopic; B, ectopic; P, proliferative phase; S, secretory phase; 3, stage 3; 4, stage 4.