title: Errata.
abstract: In the paper "The Effect of Choline-Deficiency on Uterine Activity of Rats," by Kraatz and Gruber (Science, March 25), the tenth line from the end, p. 312, ". . . choline every second" should be amended to read "...choline every second day."
authors.forename: C P
authors.initials: CP
authors.lastname: Kraatz