Bruzik JP, Maniatis T.

Nature. 1992 Dec 17;360(6405):692-5. doi:10.1038/360692a0

Spliced leader RNAs from lower eukaryotes are trans-spliced in mammalian cells.

Trans-splicing in vivo in COS cells and in vitro in HeLa cell extracts, using splice leaders and actin genes from C. elegans and Leptomonas colosoma, and also using an adenoviral RNA as acceptor.