The authors and journal apologize for an error in the above paper, which appeared in volume 131 part 4, pages 721–732. Psg21 should read Psg23 and Psg21 should read Psg23 throughout the text. The authors' explanation is given below.
“It has been pointed out to us that in our paper Wynne et al. (2006; PMID:16595723), in which we report the development of a rabbit anti-mouse pregnancy-specific glycoprotein (Psg) polyclonal antiserum, there is a labelling error. Throughout the text we refer to Psg21 protein, Psg21 RNA probe, and Psg21 anti-serum, whereas in the figure legends we refer to Psg23 anti-serum. Because we could not trace the source of this error, we re-sequenced the DNA vectors used in the study and we confirmed that all of the reagents were for Psg23, not Psg21. There are no further implications of this error because Psg21 and Psg23 are virtually identical proteins (95% identity over 471 amino acids), and both are expressed in extraembryonic tissues.”
