Eur. J. Biochem. 90, 633 (1978) Corrections Volume 83, No. 2 Transfer of bovine J-blood-group determinant onto erythrocytes : isolation and identification of a blocker, by H. Stephan and 0. W. Thiele. Page 550, Fig. 1, second sequence of incubations: for 3. + donor read 3. + blocker.