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Principal components analysis (PCA) and unsupervised clustering by known long intergenic non-coding RNAs (lincRNAs). (A) PCA shows that all tumors except 1 form a distinct cluster from the normal tissues; normal lung tissues (N); lung tumors (T); (B) Unsupervised clustering shows the similar pattern. Both suggest the tumors and normal tissues have distinct lincRNA transcription programs.
