Internal ribosome entry site-mediated translation of Smad5 in vivo: requirement for a nuclear event. - Kazuko Shiroki; Chieko Ohsawa; Natuki Sugi; Motoaki Wakiyama; Kin-ichiro Miura; Manabu Watanabe; Yutaka Suzuki; Sumio Sugano (Nucleic Acids Res., 2002)