A similarity matrix is a matrix of scores which shows the similiarities between two data values. This matrix compares and contrasts different signatures. while the white spaces represent signatures with significant commonalities, the deeper red hues represent those with greater similarities. Image was taken from: http://http://www.google.com/imgres?imgurl=http://www.biomedcentral.com/content/figures/1471-2164-8-353-5-l.jpg&imgrefurl=http://www.biomedcentral.com/1471-2164/8/353/figure/F5%3Fhighres%3Dy&usg=__y--fGT8xJ6AC0J834O0RFFyUzm8=&h=1200&w=1200&sz=326&hl=en&start=0&sig2=eJFvBSLkCp8AjykmHWj7Pg&tbnid=2YCExa9VRj-1LM:&tbnh=132&tbnw=131&ei=A0xTTL-0LoOClAeUmJ1u&prev=/images%3Fq%3Dsimilarity%2Bmatrix%26hl%3Den%26sa%3DG%26biw%3D1276%26bih%3D579%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=hc&vpx=412&vpy=95&dur=1540&hovh=225&hovw=225&tx=96&ty=125&page=1&ndsp=19&ved=1t:429,r:2,s:0
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