a mechanism capable of producing new kinds of RNAs, which could code for novel proteins

The formation of chimeric mRNAs is a strategy used by human cells to increase the complexity of their proteome, as revealed by the ENCODE project. Here, we use Saccharomyces cerevisiae to show a way by which trans-spliced mRNAs can be generated.......

http://www.pnas.org/cgi/reprint/0800420105v1