GO:0000370 | Definition | Recognition of the intron branch site sequence of a U2-type intron. This recognition may include an interaction between the U2 snRNA (as part of the U2 snRNP) and the branch site sequence of the pre-mRNA. In cis-splicing, the U1 snRNP, already associated with the 5'-splice site may also be involved in recruiting the U2 snRNP to the branch site. |