title: Erratum.
abstract: In figure 1 (p. 528) of the Report "Identification of a family of muscarinic acetylcholine receptor genes" by T. I. Bonner et al. (31 July, p. 527), the entire deduced amino acid sequence of the human M2 receptor and the sequences corresponding to the third cytoplasmic loops of all the receptors were omitted. A correction appears on page 1628.