title: Correction.
abstract: In the report "Motor neuron degeneration in mice that express a human Cu, Zn super-oxide dismutase mutation" by M. E. Gurney et al. (17 June 1994, p. 1772)(1), a systematic, 10-fold error was made in calculating the dilutions of brain extract used for determinations of total brain superoxide dismutase (SOD) activity shown in column 6 of table 1 (p. 1774). Each value reported should have been reduced by that factor, for example, the total SOD activity reported for the G1 line should have been 4.26 +/- 0.2 SOD (U)/total protein (microg), not 42.6 +/- 2.1 U/microg, and so forth.
authors.forename: M E
authors.initials: ME
authors.lastname: Gurney