Table 5. Kendall’s tau-b two tailed test result for correlation analysis of the length of transcripts and motif enrichment frequency.

Selected transcripts	Number of transcripts	Correlation coefficient	Correlation strength
All exosomal transcripts	26	0.52	weak
All cellular transcripts	19	0.16	negligible
All over expressed transcripts in cancer exosomes	141	0.42	weak
All over expressed transcripts in cancer cells	151	0.24	negligible
All correlations are significant at 0.01 level.