tokens: The pre mRNA splicing factor U2AF ( U2 small nuclear ribonucleoprotein particle [ snRNP ] auxiliary factor ) plays a critical role in 3 ' splice site selection .
folded_tokens: the pre mrna splicing factor u2af ( u2 small nuclear ribonucleoprotein particle [ snrnp ] auxiliary factor ) play a critical role in 3 ' splice site selection .