Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Recent researches suggest that polyadenylation site choice can be influenced by physiological conditions including cell growth, differentiation, developmental stage, and pathological events such as cancer.21,22,36 Mayr and Bartel found that cancer cell produce more mRNAs with short 30UTR, including for Dicer, which indicates that the proximal polyadenylation site is used more frequently.15 The results of the current study are contrary to those of Mayr and Bartel and one reason may be the low transcriptional activity of Dicer in CRC.
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