- Conditional lethality of null mutations in RTH1 that encodes the yeast counterpart of a mammalian 5'- to 3'-exonuclease required for lagging strand DNA synthesis in reconstituted systems. Sommers, C.H., Miller, E.J., Dujon, B., Prakash, S., Prakash, L. J. Biol. Chem. (1995)