Figure 1From: Association of cytokine and matrix metalloproteinase profiles with disease activity and function in ankylosing spondylitis Hierarchical cluster analysis of serum matrix metalloproteinase levels in patients with ankylosing spondylitis. Results are displayed as a heat map and dendrogram in which the relative levels of matrix metalloproteinases (MMPs) are represented by shades of yellow/red (high) and blue (low). Each row represents the MMP profile for an individual patient, each of which is represented by a number on the vertical axis. Each column represents a different MMP (MMP-1, MMP-2, MMP-3, MMP-8 and MMP-9, left to right). C1, high MMP cluster; C2, low MMP cluster.Back to article page