- Yeast shuttling SR proteins Npl3p, Gbp2p, and Hrb1p are part of the translating mRNPs, and Npl3p can function as a translational repressor. Windgassen, M., Sturm, D., Cajigas, I.J., González, C.I., Seedorf, M., Bastians, H., Krebber, H. Mol. Cell. Biol. (2004)