BIOCHEMISTRY. For the article “Structure and expression of the murine retinoblastoma gene and characterization of its encoded protein,” by Rene Bernards, Gregory M. Schackleford, Monica R. Gerber, Jonathan M. Horowitz, Stephen H. Friend, Manfred Schartl, Emil Bogenmann, Joyce M. Rapaport, Terry McGee, Thaddeus P. Dryja, and Robert A. Weinberg, which appeared in issue 17, September 1, 1989, of Proc. Natl. Acad. Sci. USA (86, 6474-6478), the author name Gregory M. Schackleford should have appeared as Gregory M. Shackleford. The corrected author line appears below. The online version has been corrected.