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Background: According to genetics, similar set of genes may affect the similar phenotypes, and the similar phenotypes may be caused by a set of similar genes.So when we know the relevant genes of a phenotype, we may be able to infer the genetic characteristics of phenotypes similar to it.So, measuring the similarity between different phenotypes is important in the study of complex physiological process, especially for complex diseases.However, there are few studies to compare the similarity between phenotypes.