Nature 386, 247–253 (1997)

In Fig. 3, the sequence in line 2 from 908 to 943 should read PGELVHMLNELFGKFDQIAKENEC…MRIKILGDC, and from 1,004 to 1,022 should be NVLCGVIGLQKWQYDVWSH. An extraneous 19 amino acids appeared at the start of the third line of the last block of sequence. This line should therefore start with AGGRA…. Also, the correct GenBank accession code for bovine type 1 adenylyl cyclase is M25579.